MAMMALS

MAMMALS

There many groups (classes) of animals. Mammals is just one group.

All mammals share some traits:

• Mammals have body hair that protects them from colds or sun.
• Mammals have 3 middle ear bones that helps give them good hearing.
• Females have milk to feed their young.
• Mammals take care of their young.
• Mammals are warm blooded.

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WARM BLOODED VERTEBRATES

• Birds and mammals are two classes of vertebrates that are said to be warm blooded. They possess various mechanisms to ensure that their body temperature is fairly constant, (unaffected by, and usually warmer than, their surroundings), so that they can function more efficiently and reliably.

Warm & Cold Blooded

• Warm blooded-only two kinds of vertebrates birds and mammals are warm blooded.Their blood and body stay the same temperature no matter how cold or hot their surroundings.These animals become ill or die if their body temperature change very much.
• Cold Blooded-Almost all animals are cold-blooded. The temperature of their blood and body changes when their surroundings became warmer or colder.

EVOLUTIONARY PRESSURES