Mammals

Mammalia

Females feed their young with milk. Hair helps retain warmth, and specialised hairs such as whiskers detect contact with the surroundings.

• egg-laying mammals Prototheria
• Theria
• Albionbaataridae
• Ambolestes
• Ameghinichnidae
• Amphidontidae
• Amphilestidae
• Argaliatherium
• Argillomys
• Arginbaataridae
• Austrotriconodontidae
• Baidabatyr
• Domestic cattle Bos taurus

  Cattle are raised as livestock across much of the world. They eat vegetation and bring swallowed food back to the mouth to chew again.

• Gray wolf Canis lupus

  A pack-living canid of Eurasia and North America. It uses habitats ranging from forests and tundra to grasslands.

• Lion Panthera leo

  A lion is a large cat that lives in groups centered on females and their young.

• Common dolphin Delphinus delphis

  A dolphin with contrasting patches along its sides that form an hourglass-like pattern.

• Domestic donkey Equus asinus

  A domestic donkey with large ears. It is a grazing animal that forms strong bonds with companions.

• Fin whale Balaenoptera physalus

  A whale with a streamlined body and a dorsal fin set well back. The lower jaw has different colors on each side.

• Domestic goat Capra hircus

  A goat raised by people for milk, fiber and meat. It prefers the company of other goats.

• Tiger Panthera tigris

  A tiger is a large striped cat. It usually lives alone and hunts by stalking and ambushing prey.

• Polar bear Ursus maritimus

  A bear that hunts on Arctic sea ice. It feeds mainly on seals and moves between ice and land.

• Killer whale Orcinus orca

  A member of the dolphin family with a black back, white belly and white patches near the eyes.

• Eurasian otter Lutra lutra

  An otter of waterways in Eurasia and northern Africa. It catches fish and other prey in water and rests in sheltered places on land.

• Domestic sheep Ovis aries

  A domestic sheep spread around the world by people. It tends to move together with other sheep.