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International Primate Protection League
The International Primate Protection League was founded in 1973 and, since this time, has been working continuously for the well-being of primates. Includes news and recent developments concerning primates, a topic search engine, audio,...
CK-12 Foundation
Ck 12: Biology: Mammal Classification
[Free Registration/Login may be required to access all resource tools.] Overview of how placental mammals are classified.
CK-12 Foundation
Ck 12: Life Science: Mammal Reproduction
[Free Registration/Login may be required to access all resource tools.] Mammals don't typically lay eggs, but monotremes are the exception. All other mammals give birth to live young and belong to one of two categories, the marsupials...
TED Talks
Ted: Ted Ed: The Three Different Ways Mammals Give Birth
Kate Slabosky details the placental, marsupial, and monotreme methods of giving birth.
National Geographic Kids
National Geographic Kids: Animals: Vampire Bats
Great multi-media site from the National Geographic Society with great information, pictures and video of Vampire Bats. Sections include fun facts, video, audio, a map and send a postcard.
CK-12 Foundation
Ck 12: Life Science: 10.21 Mammal Reproduction
Learn all about mammal reproduction.
Biology 4 kids
Biology4 Kids: Introducing the Mammals
What different types of mammals exist in the world? Peruse this information about mammals that lay eggs, mammals with pouches, and those that give birth to live animals.
CK-12 Foundation
Ck 12: Biology: Evolution of Early Mammals
[Free Registration/Login may be required to access all resource tools.] Overview of the evolution of monotreme, marsupial, and placental mammals.
University of California
Ucmp: Placental Mammals
This brief article defines "placental mammals," lists examples of these animals, and describes the characteristics which render their classification.