What
is a Mammal?
Mammals have become the dominant animal group on
earth, thriving in virtually every habitat.
They share several advanced characteristics.
Warm Blooded--Unlike cold-blooded animals, a mammal’s body makes enough heat on its
own to stay at a consistent temperature.
Hair--Mammals are the only animals with hair. A mammal’s hair, which is
often call fur, helps to protect
it from wind, rain, sun, cold, and insects.
Lactation--Female mammals are the only creatures on earth that make milk for
their young (known as lactation). The milk is rich in vitamins, minerals, and
all the other nutrients a young animal needs.
Intelligence--Mammals have larger, more well-developed brains than other animals.
Most mammals have memories and are able to learn new things throughout their
lives.
Parenting--Most
mammals give their young more protection and training than do other animals.
Aside from these five major
differences, other unusual characteristics of mammals include a
four-chambered heart, a lower jaw with a single bone on each side, and an
outer ear.
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