| |
What separates mammals from
all other animals? Only mammals:
- Possess hair
- Produce milk by modified sweat glands called mammary
glands
- Have three middle ear bones
Mammals can run, jump, swim,
dive, burrow, walk, crawl, glide, and even fly.
The 5000 species in the class of mammals live
on every continent and in every sea on our planet.
Their size varies widely, from as small as the
pigmy shrew, weighing about 2.5 g (less than 0.1
oz), to the largest animal ever to live on Earth:
the blue whale, which weighs as much as 136,000
kg (150 tons) and grows to 31 m long.
|
