There are two contenders for the world's smallest mammal, depending on whether one is going by length or weight. The world's lightest mammal is the Etruscan shrew, while the shortest is Kitti's hog-nosed bat. More »

The blue whale is the largest mammal on earth. This species reaches lengths of 100 feet long and weighs up to 200 tons. The blue whale is believed to be the largest mammal ever to exist on earth. More »

To be considered a mammal, an animal must produce milk to feed its young, have hair on its body, be a vertebrate and be warm blooded. Animals not falling into these categories are not mammals. More »

The slowest living creature on Earth is the sloth, which is an herbivorous mammal that is primarily found in South and Central American rain forests. Sloths are especially slow on land because they have weak hind legs th... More »

According to National Geographic, the blue whale, a mammal, grows up to 100 feet in length and can weigh over 200 tons. It's the largest animal ever known to exist. Despite its enormous size, the blue whale's diet consis... More » Science Biology Zoology

The food eaten by mammals varies based on the type of mammal, the season and the environment. Mammals can be classified as carnivores, herbivores and omnivores. Carnivores primarily eat meat, herbivores primarily eat pla... More »

A fish is not a mammal. Mammals are animals that are warm-blooded, breathe air, possess hair and give birth to live young that they feed milk from mammary glands. Fish are cold-blooded, extract oxygen from water, have sc... More »