Mammals live in all regions and climates. They live on the ground, in trees and even underground. Polar bears, reindeer, and seals are mammals that live in the Arctic regions. Others, for example camels or kangaroos, prefer the world's dry areas. Seals and whales are mammals that swim in the oceans; bats are the only mammals that can fly.

Colony of seals
Image: M. Boylan, Public domain, via Wikimedia Commons



Mammals have five features that make them different from other animals:

  • Female mammals produce milk and feed their babies with it.
  • Only mammals have hair or hair-like skin. All mammals have hair at least some time in their lives.
  • Mammals are warm-blooded. Their body temperature always stays the same and does not change with the outside temperature.
  • Most mammals have a larger and well-developed brain. They are more intelligent than other animals.
  • Mammals protect their babies more than other animals. They prepare them for future life.



Pigs sucking milk from their mother
Image : Wiki.cullin, CC BY-SA 4.0, via Wikimedia Commons

People have hunted mammals for ages. They ate their food and made clothes out of their skins. Thousands of years ago, wild mammals were domesticated and gave human beings milk, wool and other products. Some mammals, like elephants and camels, are still used to transport goods. In poorer countries farmers use cows or oxen, to plough fields.



Animals ploughing fields in India
Image: ©Yann Forget - Wikimedia Commons

Today, some mammals are hunted illegally. Whales are killed because people want their meat and oil, elephants are killed for their ivory and tusks.

Mammals are often kept as pets. Among them are cats, dogs, rabbits, or guinea pigs.

Mammals are useful to people in many other ways. Some help plants grow and eat harmful insects. Others eat weeds and prevent them from spreading too far. The waste of mammals is used as fertilizers that improve the quality of soil.



Tusks of an African elephant
Image: Taken by Schuyler Shepherd, CC BY 2.5,
via Wikimedia Commons


Words

  • ages = a very long time
  • Arctic = area around the North Pole
  • brain = organ inside your head that controls the way you feel, think and move
  • domesticate = to train an animal so that it can work for people or be a pet
  • feature = quality, characteristic
  • feed = to give food to ...
  • female = belonging to the sex that can lay eggs or give birth to babies
  • fertilizer = substance that is put on the soil to make plants grow
  • goods = products of everyday life
  • guinea pig = small furry animal with short ears and no tail ; it is often kept as a pet
  • harmful = dangerous
  • human beings, humans = people
  • illegally = against the law
  • improve = to make better
  • ivory = the hard, smooth, yellow material from the tusks of elephants
  • most popular = best known
  • plough = turn over the earth so that seeds can be planted
  • prefer = like
  • prevent = stop
  • protect = defend against enemies
  • reindeer = a large deer with long horns that lives in northern, colder areas
  • seal = a large sea animal that eats fish and lives around the coast
  • soil = top layer of the earth on which plants grow
  • spread = to move from one place to another
  • tusk = long curved tooth of an elephant
  • useful = helpful
  • waste = the material that animals leave behind after they digest food
  • weed = wild plant that prevents crops or garden flowers from growing the right way
  • well-developed = very complex and something that works well
  • whale = very large mammal that swims in the sea