21. Www.mrnussbaum.com - Mammals Games involving mammals. Everglades Spelling Poacher Trap Rainforest Rangers Arctic Adverturers Keepers of the Wetlands http://www.mrnussbaum.com/mammalsindex.htm

Mammals Activities Lesson Plan Options Mammals Scavenger Hunt Mammals Crossword Mammals Hangman ... What is a mammal? Games involving Mammals Everglades Spelling Poacher Trap Rainforest Rangers Arctic Adverturers ... Habitat Maker Most Popular Games Place Value Pirates Math Fries Tony Fraction's Pizza Shop Death to Decimals ... Conquer the Continents Web mrnussbaum.com addthis_url = location.href; addthis_title = document.title; addthis_pub = 'hamilton989'; Learn more about MrNussbaum Premium MrNussbaum CD Home Science ... Mammals Mammals Privacy Policy Advertise on this site Best teacher sites var site="s20sterling20"

22. NMNH Department Of Systematic Biology, Division Of Mammals - Mammal Species Of T A database of mammalian taxonomy providing an online reference for identifying or verifying recognized scientific names and for taxonomic research. http://nmnhgoph.si.edu/msw/

Division of Mammals Mammal Species of the World (MSW) We are currently underway in the planning and development stages of creating a new and improved online query and export facility for the updated MSW3 data. We expect to launch the new application in early 2008. Please check back for news and updates related to the facility. In the meantime, the MSW3 authors in collaboration with Bucknell University have created an interim query presentation at: http://www.bucknell.edu/msw3/ Also, the new complete list of species as recognized in MSW3 are available from the following: Browse the Checklist of Mammal Names as Text (256 KB, text only) Download the Checklist of Mammal Names (945 KB, MS Excel format) Download the Checklist of Mammal Names (376 KB, CSV format) Download the Checklist of Mammal Names (529 KB, PDF) Download the Checklist of Mammal Names (165 KB, ZIP format) Wilson, D. E., and D. M. Reeder (eds). 2005. Mammal Species of the World. Johns Hopkins University Press, 2,142 pp. (Available from Johns Hopkins University Press, 1-800-537-5487 or

23. Mammals | Mammals News, Research And Current Events Brightsurf mammals news and mammals current events, research and discoveries. http://www.brightsurf.com/search/r-a/Mammals/1/Mammals_news.html

Brightsurf Science News Latest science news and current events. RSS Top Science News Most viewed science news and current science event articles this week. RSS Add Brightsurf Science News to your Web Site Science Resources Earth Science Space Science Life Science Fields of Scientific Study ... Nanotechnology Articles Science RSS News Feeds Earth, Life and Space Science RSS News Feeds. Earth Science RSS News Space Science RSS News Life Science RSS News Fields of Scientific Study RSS ... Next Sort By: Page Views Date Yale researchers find environmental toxins disruptive to hearing in mammals Yale School of Medicine researchers have new data showing chloride ions are critical to hearing in mammals, which builds on previous research showing a chemical used to keep barnacles off boats might disrupt the balance of these ions in ear cells. view more Does missing gene point to nocturnal existence for early mammals? A gene that makes cells in the eye receptive to light is missing in humans, researchers have discovered. view more 'Killer' B cells provide new link in the evolution of immunity Researchers from the University of Pennsylvania School of Veterinary Medicine have discovered a unique evolutionary link between the most primitive innate form of immune defense, which has survived in fish, to the more advanced, adaptive immune response present in humans and other mammals.

24. Mammals - Photo.net Given the rich diversity of Costa Rica s ecosystems, it may come as a surprise that there are only 200 mammal species in the nation, half of which are bats. http://photo.net/cr/moon/mammals.html

@import url(/v2css/complex-20070911.css); Forums Unified View All Forums Business ... Handbook Popular links: Advice from Professional Wedding Photographers Editors' Picks: Winter Photos Interview with Jeff Ascough - Wedding Photographer Top Member Photos New reviews/articles: Sony System Overview Nikon D300 Review Pentax K10D Review Sony A200 Preview Share This Page: Digg.com Reddit.com Del.icio.us Google Bookmarks ... Print Mammals of Costa Rica by Christopher Baker ; created 1995 Given the rich diversity of Costa Rica's ecosystems, it may come as a surprise that there are only 200 mammal species in the nation, half of which are bats. And Costa Rica, like most neotropical countries, has "a depauperate marine mammal flora," in the words of one biologist. Several species of dolphins and seven species of whales are common in Costa Rican waters, but there are no seals. And the only endemic species of any significance is the endangered manatee. Before man hunted them to extinction, there were many more mammal species. Even today all large and many small mammal populations are subject to extreme hunting pressure or habitat destruction, and it is only recently that large-mammal populations in the national parks are beginning to recover. Like most large mammals, jaguars and tapirs are shy and stay well clear of people. Sighting one would be cause for great celebration! Still, most visitors can expect to see one or more species of monkeys, one of Costa Rica's four ecologically unique tropical mammals; the others are sloths, anteaters, and noninsectivorous bats. And luck, patience, and the aid of a professional guide can lead to thrilling encounters with other species.

25. Strange Science: Mammals Over the centuries, our understanding of mammals, both living and extinct, has improved considerably. Just the same, scientists have made some mistakes, http://www.strangescience.net/stmam2.htm

Year: Author: Thomas Coryate (or Coriate) Originally published in: Thomas Coriate Traveller for the English Wits: Greeting: From the Court of the Grand Mogul, Resident at the Towne of Asmere, in Easterne India Now appears in: The Book Nobody Read by Owen Gingerich Coryate claimed to see two unicorns in his travels to India. As astronomer and science historian Owen Gingerich has observed, this woodcut is trimmed, which suggests that the picture was actually copied from an earlier work (perhaps Conrad Gesner's). One reason unicorns held such fascination for medieval and Renaissance Europeans was that their horns, called alicorns, were thought to protect their owners from poison. Europe's royal families often acquired political power by poisoning their enemies, and some of the upper crust may not have been above testing their concoctions on their own family members. Year: Artist: Erhard Reuwich Originally published in: Perigrinationes ad Terram Sanctam Now appears in: The Unicorn by Nancy Hathaway Year: Scientist/artist: Nicolaus Witsen Originally published in: Noord en Oost Tartarye Now appears in: The Lore of the Unicorn by Odell Shepard These narwhal skull illustrations have a minor error in that the furrows run clockwise, which they apparently don't do in nature. This small mistake, however, is more than offset by the much bigger mistake the illustration corrects. The adult males of these marine mammals have ivory tusks extending from the left side of the upper jaw. These tusks, often sold as alicorns, had long been believed to be unicorn horns.

26. Hairy Museum Of Natural History » Mammals Indohyus is a member of the Raoellidae, an obscure, extinct family of hoofed mammals closely related to the artiodactyls (eventoed hoofed mammals, http://www.hmnh.org/archives/category/chordates/bony-fish/tetrapods/synapsids/ma

@import url( http://www.hmnh.org/wp-content/themes/hairstyle/style.css ); About the HMNH Galleries Library Paleo-Pop Shop ... Links Cruise the HMNH Archive through Time: Cenozoic Neogene Paleogene Mesozoic ... Precambrian or Phylogeny: Chordates Sharks Bony Fish Tetrapods ... Birds other Categories: Friends of the HMNH Ich-Theology Invertebrates Miscellany ... RSS Front Page Archives December 2007 November 2007 October 2007 September 2007 ... January 2007 Links: When Pigs Fly The Lancelet Prehistoric Pulp Catalogue of Organisms ... ...except where otherwise noted December 20, 2007 Indohyus and Cetacean Relations Indohyus restoration by Carl Buell Meet Indohyus The image above, created by artist Carl Buell, shows a charming little animal called Indohyus , about the size of a modern raccoon, that lived some 50,000,000 years ago in what is now northern India. Indohyus is a member of the Raoellidae , an obscure, extinct family of hoofed mammals closely related to the artiodactyls (even-toed hoofed mammals, currently represented by pigs, hippos, camels, deer, etc.) Raoellids are only known from Eocene-aged (56–34 million year-old) fossils from southern and southeastern Asia. Like any good group of obscure, extinct mammals, the raoellids were primarily known from fossil teeth. Until this week, that is, when a team of scientists led by Hans Thewissen described new cranial and postcranial fossils of

27. Mammals And Their Habitats Membership including the subscription is $15.00 per year), include at least one story about a mammal. Here are a few specific articles, all from Ranger http://www.libsci.sc.edu/miller/Mammals.htm

Collaborative Thematic Unit Theme: Mammals by Cody Carlton and Ann Riza Grade Level: Grades 2-3 Focus : Students will explore mammals of different regions of the world. Objectives : On completion of this unit, students will: 1) Know the general characteristics of mammals. 2) Be able to name at least five mammals from their specific assigned region. 3) Be able to name at least one mammal from the other regions. 4) Identify at least two adaptations of a mammal to its specific region. Resources and Materials Hiller, Ilo. Introducing Mammals to Young Naturalists Schell, Karen D. Theme Book: Animal Habitats (Grade 2). Frank Schaffer Publications, Inc., 1992. Tryon, Leslie. Who Am I? . Monterey, CA:Evan-Moor Corp., 1987. Western Regional Environmental Education Council. Project WILD . Published by author, 1992. Western Regional Environmental Education Council. Aquatic Project WILD . Published by author, 1992. Internet Resources: Sea World Animal Information Database http://www.bev.net/education/SeaWorld Includes animal facts, photos, and resources. Students can join Jack Hanna on a safari via the internet (March, 1997). Check for other "tours" at later dates.

28. Thematic Units - Mammals mammals Thematic Units, Lesson Plans and Teacher Resources. http://www.theteacherscorner.net/thematicunits/mammals.htm

Math Lesson Plans Music Lesson Plans Physical Education Reading Lesson Plans ... Thematic Units : Mammals Thematic Units - Mammals Mammals You will find various Web Sites on the top portion of this page. Further down, you will find Lesson Plans At the bottom of the page, you will find Books that you can order directly from Amazon.com! Web Sites Animal Channel Arctic Wildlife Portfolio Learn about the mammals that can be found in this region of the world. Grasslands Biom Mammals that call the grasslands their home. Hall of Mammals "An extensive taxonomy from the University of California Museum of Paleontology." Kid's National Geographic National Wildlife Federation Search for mammal information. OceanLink Learn about all of the great Marine Mammals. The Mammal Society Zoo Animals Lesson Plans This indicates resources located on The Teacher's Corner Culminating a Mammal Unit Grades 2+ A simple hands-on activity for the end of your unit. Submitted by: Sj295@email-removed Bears Grades Various A complete unit!

29. The Belize Zoo - The Mammals Index mammals are a group of animals with backbones, bodies covered by hair, nurse their young with milk, and have a unique jaw articulation. mammals are also the http://www.belizezoo.org/zoo/zoo/mammal.html

Mammals are a group of animals with backbones, bodies covered by hair, nurse their young with milk, and have a unique jaw articulation. Mammals are also the group of animals to which humans belong. Belize has approximately 145 mammal species living within its boundaries. Mammals exist within all the different habitats of Belize, from the manatee and dolphins of the coastal zone, to the 5 different species of wildcat which live deep within the rainforests of the Maya Mountains. The rainforest mammals of Belize tend to be very secretive and mostly nocturnal. This makes them extremely difficult to see. They usually see, hear, smell, or feel you long before you them. Rainforest mammals do not stand out in the open for easy viewing, but instead climb through the canopy or scurry over the forest floor well ahead of you. That is one reason the Belize Zoo is such a special place. Here you can see many of the rainforest species of Belize easily. A visit to the zoo is the best way to get an introduction to the animals of Belize, and to understand why it is important to protect the habitats that sustain them. We hope this website will be the next best thing to visiting us in person. Jaguar Margay Ocelot Coati ... Naturalight Productions Ltd.

30. Mammal Technical Committee The Mammal Technical Committee was organized in 1979. A first contribution was Chapter 6 mammals in Species of Special Concern in Pennsylvania. http://www.dickinson.edu/prorg/pabs/mammals.htm

PABS Home Constitution History Steering Committee ... "Box Score" of Species MAMMAL TECHNICAL COMMITTEE (MTC) The Mammal Technical Committee was organized in 1979. A first contribution was "Chapter 6 - Mammals" in Species of Special Concern in Pennsylvania. In 1989 the Mammal Technical Committee, along with the Ornithological Technical Committee, was designated byt he Pennsylvania Game Commission (PGC) as an official scientific advisory committee to the Commission. Under the terms of a Memorandum of Understanding between the Biological Survey and the PGC, representatives of these two technical committees and the Game Commission meet annually to discuss matters relating to the Commonwealth's mammals and birds. Since publication of Species of Special Concern in Pennsylvania, the committee had undertaken a number of research initiatives, several of which were funded by grants from the Pennsylvania Wild Resource Conservation Fund. The results of two of these projects, a comprehensive assessment of the statuses of the mammals of Pennsylvania and a survey of the Statuses of Pennsylvania's cave-dwelling bats, were published in the Journal of the Pennsylvania Academy of Science. Other committee initiatives have included work on the statuses of solitary tree bats in southcentral and northern Pennsylvania, effeorts to determine the status of the least shrew (

31. Free Mammals Word Search - Animal Classification Free online games for kids. Elementary science game. Animal classification for mammals. Kids learn about some mammals by playing this matching puzzle game. http://www.apples4theteacher.com/mammalws.html

Puzzles Color Holiday Fun Shop A Fun Primary Website for Teachers and Kids January 24, 2008 Arts Languages Literacy Math ... Teachers Interactive science games for kids - Animal Classification Home Science Games Animal Classification Mammal Word Search - Find eleven mammals hidden in the puzzle. Free Fundraiser Ideas Amazon Kindle Amazon's new wireless reading device. This game or printout requires the Flash 5 Plugin Printable Valentine Party Games Category: Animal Classification Activities - Mammals Kids Level: kindergarten, elementary Science Articles Science Fairs in Elementary School Science Misconceptions Research and Some Implications for the Teaching of Science to Elementary School Students Email this page to a friend var addthis_pub = 'nmjudy.aol.com'; Other Mammal Games and Animal Classification Mammal Match Mammal Word Search Bird Word search - Birds wordfinds ... Reptile wordfinds - reptiles word search ADD, ADHD, Literacy, ESL, Special Ed, Bilingual Ed, Gifted, Health Ed, Early Childhood Education Home Calendar Weblinks Search ... Sitemap Online Games and Resources for Toddlers, Preschoolers, Kindergarten, and Elementary Students

32. Mammals A brief discussion of mammals, focusing on how they are evolutionarily advanced over other animal types. http://www.backyardnature.net/mammals.htm

MAMMALS IN GENERAL R eptiles arose from amphibians, and birds arose from reptiles. However, mammals, such as the Armadillo shown above in my backyard, did not arise from birds. Mammals, like birds, arose from early reptiles, though from a different reptilian stock than the birds. Here are the main "new inventions" nature came up with that made us mammals more complex beings than amphibians, reptiles and birds: Mammals, like birds, but unlike their reptilian ancestors, are warm-blooded their bodies stay warm, even when surrounded by cold air. Mammal bodies are covered with hair, which helps the body stay warm; even the Armadillo above has hairs. Mammal teeth come in a variety of shapes, known as incisors, canines, premolars and/or molars, with each tooth type specialized for stabbing, cutting, tearing, or grinding of food. Reptilian teeth aren't nearly as diverse. Mammal ears are relatively complex, the middle ear containing three bones, as opposed to only one bone in the middle ear of reptiles and birds. Mammal brains are much larger than those of reptiles, enabling greater intelligence and consequent flexibility of behavior.

33. Endangered Mammals A display of some of the endangered mammals found around the world. http://www.geocities.com/RainForest/vines/1460/mammal.html

Endangered Mammals Last updated: June 19, 2002 The following is a list of several endangered mammals. They are all classified as endangered or critically endangered by the 2000 IUCN Red List , published by the International Union for Conservation of Nature and Natural Resources. To find out more about each animal, click on their name. Elephants (Proboscidea) Elephantidae African Elephant (Loxodonta africana) Asian Elephant (Elephas maximus) Whales (Cetacea) Balaenidae Right Whale (Eubalaena glacialis) Balaenopteridae Blue Whale (Balaenoptera musculus) Fin Whale (Balaenoptera physalus) Primates (Primates) Callitrichidae Golden Lion Tamarin (Leontopithecus rosalia) Cebidae Hybrid Spider Monkey (Ateles belzebuth hybridus) Daubentoniidae Aye-aye (Daubentonia madagascariensis) Hominidae Western Gorilla (Gorilla gorilla) Carnivores (Carnivora) Canidae Red Wolf (Canis rufus) Felidae Amur Leopard (Panthera pardus orientalis) Anatolian Leopard (Panthera pardus tulliana) Asiatic Cheetah (Acinonyx jubatus venaticus) Florida Cougar (Puma concolor coryi) ... Tiger (Panthera tigris) Mustelidae Marine Otter (Lutra felina) Ursidae Giant Panda (Ailuropoda melanoleuca) Lesser Panda (Ailurus fulgens) Even-Toed Hoofed Mammals (Artiodactyla) Bovidae Cuvier's Gazelle (Gazella cuvieri) Western Giant Eland (Tragelaphus derbianus derbianus) Camelidae Wild Bactrian Camel (Camelus bactrianus) Cervidae Manipur Brow-Antlered Deer (Cervus eldii eldii) Odd-Toed Hoofed Mammals (Perissodactyla) Rhinocerotidae Black Rhinoceros (Diceros bicornis) Marsupials (Marsupialia)

34. MIKIDS For YOUR KIDS! mammals are warmblooded, have hair, and produce milk. There are 3 types of mammals. 1. Placental mammals are live, fully-formed babies at birth mammals. http://www.mikids.com/mammals.htm

Enter your search terms Submit search form MAMMALS Mammals are warm-blooded, have hair, and produce milk. There are types of mammals. Placental Mammals are live, fully-formed babies at birth mammals. Armadillo Bobcat Chimpanzee Deer white-tailed Elephant Fox Giraffe Hedgehog ... Mammals from A-Z *terms Marsupial Mammals are pouched mammals. Bandicoots Kangaroos Koalas Australian Possums ... Wombats Monotreme Mammals are egg-laying mammals. Echidna Platypus Home Carolyn Gundrum teacher-author

35. WDNR - Checklists Of Wisconsin Vertebrates - Mammals Taxonomy in the mammal checklist follows that in the Revised Checklist of North American mammals North of Mexico, 1997 published by the Museum of Texas Tech http://dnr.wi.gov/org/es/science/publications/VertChklist/Mammals.html

Program Search Home About Topics ... Publications Wisconsin Vertebrate Checklist Abstract Introduction Fishes Amphibians ... Acknowledgements Species Lists Fishes Amphibians Reptiles Birds ... Mammals Other Wisconsin Flora and Fauna Checklists Butterflies [Exit DNR] Dragonflies [Exit DNR] ... More... Mammals Download the information contained in this page as a 500K PDF File Taxonomy in the mammal checklist follows that in the Revised Checklist of North American Mammals North of Mexico, 1997 published by the Museum of Texas Tech University (Jones, et al The Smithsonian Book of North American Mammals (Wilson and Ruff 1999) , and Mammals of North America: Temperate and Arctic Regions (Forsyth 1999) . Species are listed alphabetically under each family. Common names follow Jones, et al and Wilson and Cole (2000) . Where Jones, et al provide more than one common name, we select the one in most frequent use in Wisconsin. We deviate from Jones, et al and Wilson and Cole (2000) in providing what we feel are more descriptive or appropriate common names for some families and orders (e.g., Mephitidae). The final revision of the mammal checklist contains 72 species in 19 families. Sixty-nine mammal species are native to the state and 3 are introduced non-native species. The Indiana Bat (

36. Mammals Mesozoic mammals tended to be somewhat insignificant limited fossil evidence indicated holding to conservative mouse-like form and quadrupedal locomotion http://www.shsu.edu/~bio_mlt/mammals.html

MAMMALIAN CHARACTERISTICS Many of the most important and diagnostic mammalian characteristics serve to further intelligence and sensibility, promote endothermy, or to increase the efficiency of reproduction or the securing and processing of food. Basic structural body plan is inherited from Therapsid mammal-like reptiles. Survival through mammalian evolution was perhaps due to their ability to move and to think more quickly than their Archosaurian counterparts. Morphological trends were toward structural simplification: • skull and jaw bones lost or reduced in size • limbs and limb girdles simplified, reduced, and less laterally splayed Fossil record provides little evidence on when endothermy actually developed. Diagnostic or Distinguishable Characteristics of Mammals: Soft Tissues Skin glands: Mammalian skin contains several kinds of glands not found in other vertebrates. Mammary Glands: Provide nourishment for the young during their postnatal period of rapid growth. Milk Composition: Milk composition varies with species: Cow’s milk 85% H2O Dry weight 20% Fat 20% Proteins 60% Sugars - largely lactose also have sweat, sebaceous, scent, and musk glands

37. Mammals - Class Mammalia mammals (Class Mammalia) are characterized by mammary glands, hair, a diaphram, a fourchambered heart, and a large cereberal cortex. http://animals.about.com/od/mammals/Mammals.htm

zOBT=" Ads" zGCID=" test1" zGCID=" test1 test9" zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') z160=zpreC(160,600);z336=zpreC(336,280);z728=zpreC(728,90);z133=zpreC(336,133);zItw=160 Animals / Wildlife var h2=document.getElementsByTagName("h2")[0];if(h2.getElementsByTagName("a")[0].firstChild.nodeValue.length>29)h2.className="long"; Home Education Animals / Wildlife Search over 1.4 million articles by over 600 experts Animals / Wildlife About.com Search Animals / Wildlife Animal Facts Habitat Facts Watching Wildlife ... Print Filed In: Mammals Mammals - Class Mammalia Mammals (Class Mammalia) are characterized by mammary glands, hair, a diaphram, a four-chambered heart, and a large cereberal cortex. 70 million years ago when reptile diversity declined, mammals took over habitats once unavailable to them. Anteaters and Relatives Hares / Rabbits / Pikas Bats Hoofed Mammals ... An Introduction to Mammals To understand mammals, it first helps to understand how they fit into the classification system of all animals. Mammals, as a group of animals, belong to the Class Mammalia. The Class Mammalia, in turn, belongs to the larger group known as the vertebrates (animals with backbones; also called the Phylum Chordata). Quiz: An Introduction to Mammals Test your knowledge of the basics of mammals in this quiz which covers fundamentals of mammal adaptation, classification, and evolution.

38. Animal Tracks - Mammal Tracks mammals are animals that are born with fur or hair. mammals produce live young which they nourish with milk. They are warmblooded and have the most highly http://www.bear-tracker.com/mammals.html

Mammals What is a Mammal? Mammals are animals that are born with fur or hair. Mammals produce live young which they nourish with milk. They are warm-blooded and have the most highly developed nervous system of all the animals. A mammal usually has four limbs and a four-chambered heart. The largest mammal is the blue whale at 100 feet in length. The smallest mammals are shrews, mice, and bats. Many are less than two inches long, excluding the tail length. Click on the name of the animal below to see a picture of its tracks and some natural history information about it. I have also included some personal notes about each species. The species below are primarily those that can be found in northern California and the west. Some of them are found throughout the U. S. As I do more research, I will add species that are found in other areas. Keep checking this page for updates. Black Bear Grizzly Bear Beaver Bobcat ... Domestic Dog Got a mammal story? E-mail me and tell me about it. tracker777@hotmail.com You are visitor number: All counters reset in October 2000.

39. CentralPets.com - Central Mammals Page This section contains information about mammals including dogs, cats, horses, marsupials, rodents, squirrels, rabbits, primates, and more. http://www.centralpets.com/pages/mammals/mammals.html

2,234 Animals Online Today Home Central Mammals Page (you are here) Search This Site: Match all words Advanced Site Search Mammals Birds Get Updates by E-mail New Items Cool Stuff Newsletter Greeting Cards Free Websites Games Classified Ads Discussion Forums Free Web Mail Search Site Map Did you find the information on this site helpful or informative? Very Helpful Helpful Somewhat Helpful Not Helpful Results More Polls Do you like games? Check out our animal related games Central Mammals Page Here you will find information on mammals that are kept in captivity. Not every animal described here is, or should be, a pet. Our goal is to provide quality information on each animal including proper care and photos. We are currently adding many types of mammals to the database. If you can't find one that you are looking for, please let us know and we will add it. The forums are open for discussion of all mammal types. The popdown menu below allows you to go directly to the forums for specific animal types. Mammals Forums: Select a Mammal Forum Cats Cattle Dogs Exotic Cats Ferrets, Skunks, Mustelidae

40. Biology4Kids.com: Vertebrates: Mammals You are a mammal. Your pet dogs and cats are mammals. An elephant is a mammal and so is a whale. When you learn about animals, the first you learn about are http://www.biology4kids.com/files/vert_mammal.html

INTRODUCING THE MAMMALS! You are a mammal. Your pet dogs and cats are mammals. An elephant is a mammal and so is a whale. When you learn about animals, the first you learn about are probably mammals. Not all mammals are made the same way. Most of the mammals you see will be placental . If you are in Australia you will see a lot of marsupials. Monotremes are tough to find. There aren't many of those left in the world. MAMMALS WITH EGGS Monotremes were the first mammals. How do scientists know? They actually lay eggs . Monotremes are more closely related to reptiles than any other mammal. They have not yet evolved a way to have their babies live. Examples of monotremes are a duck-billed platypus and the spiny anteater. MAMMALS WITH POUCHES There are many more marsupials than monotremes. Kangaroos, koalas, bandicoots, and possums. You'll find a lot of them in Australia. Australia is an island continent. Because of its isolation, placental mammals didn't take hold in their ecosystems. Australia is like a mammalian time capsule. Marsupials are special mammals that give birth to their young live, but the babies mature in pouches . While they are in the pouch they suckle on the mother's milk for nourishment. LIKE YOU AND ME Placental mammals are the dominant form of mammal on the planet. Placental mammals deliver their young live and ready for action. Although the babies might still need some work, much of the basic development is done inside of the female's

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