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Mammals in which nutrients, oxygen, carbon dioxide, and wastes are exchanged efficiently between embryo and mother through the placenta
Insect eaters that have long, narrow snouts and sharp claws that are well suited for digging. Examples: shrews, hedgehogs, and moles
Herbivores that live in river, bays, and warm coastal waters scattered throughout most of the world. Large, slow-moving mammals that lead fully aquatic lives. Examples: manatees and dugongs
Adapted to underwater life yet must come to the surface to breathe. Most live and breed in the ocean. Examples: humpback whales, narwhals, sperm whales, beluga whales, and river dolphins
Winged mammals--or bats-- are the only mammals capable of true flight, Bats account for about one fifth of all mammalian species, and are part of this order. They eat mostly insects or fruit and necar, although three species feed on the blood of other vertebrates
Have a single pair of long curved incisor teeth in both their upper and lower jaws, which they use for gnawing wood and other tough plant material. Exampels: mice, rats, voles, squirrels, beavers, porcupines, gophers, chipmunks, gerbils, prairie dogs, and chinchillas
This order contains hoofed animals with an odd number of toes on each foot. Examples: horses, tapirs, rhinoceroses, and zebras
Many mammals in this order, such as tigers and hyenas, stalk or chase their prey by running or puncing, then kill the prey with sharp teeth and claws. Some animals in this group eat plants as well as meat. Examples: dogs, foxes, bears, raccoons, and walruses
These hoofed mammals have an even number of toes on each foot. Like perissodactyls, this order contains mostly large grazing animals. Examples: cattle, sheep, goats, pigs, ibex, giraffes, hippopotami, camels, antelope, deer, and gazelles
Liek rodents, members of this order are entirely herbivorous. They differ from rodents by having two pairs of incisors in the upper jaw. Most have hind legs that are adapted for leaping. Examples: snowshoe hares and rabbits
Most of the mammals in this order have simple teeth without enamel, and a few have no teeth at all. Examples: sloths, anteaters, and armadillos
Members of this order are closely related to the ancient insectivores but have a highly developed cerebrum and complex behaviors. Examples: lemurs, tarsiers, apes, gibbons, macaques, and humans
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