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12.26: Mammal Living and Locomotion

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What allows this cheetah to be so fast?

Do you think it has something to do with the placement of the limbs? Well, it does. Look closely at the cheetah's body. Can you describe why it is so fast?

Social Living in Mammals

Many mammals live in social groups. Social living evolved because it is adaptive. Consider these two examples:

  1. Herbivores such as zebras and elephants live in herds . Adults in the herd surround and protect the young, who are most vulnerable to predators.
  2. Lions live in social groups called prides . Adult females in the pride hunt cooperatively, which is more efficient than hunting alone. Then they share the food with the rest of the pride. For their part, adult males defend the pride’s territory from other predators.

Locomotion in Mammals

Mammals are noted for the many ways they can move about. Generally, their limbs are very mobile. Often, they can be rotated. Many mammals are also known for their speed. The fastest land animal is a predatory mammal. Can you guess what it is? Racing at speeds of up to 112 kilometers (70 miles) per hour, the cheetah wins hands down. In addition, the limbs of mammals let them hold their body up above the ground. That’s because the limbs are attached beneath the body, rather than at the sides as in reptiles (see Figure below ).

Limb Positions in Reptiles and Mammals. The sprawling limbs of a reptile keep it low to the ground. A mammal has a more upright stance.

Mammals may have limbs that are specialized for a particular way of moving. They may be specialized for running, jumping, climbing, flying, or swimming. Mammals with these different modes of locomotion are pictured in Figure below .

Mammalian Locomotion. Mammals have many different modes of locomotion.

The deer in the Figure above is specialized for running. Why? It has long legs and hard hooves. Can you see why the other animals in the figure are specialized for their particular habitats? Notice how arboreal , or tree-living animals, have a variety of different specializations for moving in trees. For example, they may have:

  • A prehensile , or grasping, tail. This is used for climbing and hanging from branches.
  • Very long arms for swinging from branch to branch. This way of moving is called brachiation .
  • Sticky pads on their fingers. The pads help them cling to tree trunks and branches.

Summary

  • Mammals live in social groups, which are an adaptive beneficial trait.
  • Mammals have many ways of moving about and may move very quickly.

Practice

Use this resource to answer the questions that follow.

  1. Describe the following:
    1. the dog walk
    2. the giraffe walk, or pacing
    3. a gallop
  2. Describe locomotion in elephant seals.
  3. What is brachiation?
  4. What percent of mammals can fly? Give some examples.
  5. What is the fastest mammal?
  6. How fast is a grizzly bear?

Review

1. A certain mammal has very long forelimbs. What does that suggest about where the animal lives and how it moves?

Vocabulary

arboreal

arboreal

Of or pertaining to trees, as in arboreal, or tree-living, mammal.
brachiation

brachiation

Locomotion involving the swinging from branch to branch.
herd

herd

A group of herbivores, such as zebras or elephants.
locomotion

locomotion

The movement from place to place.
prehensile tail

prehensile tail

A grasping tail; used for climbing and hanging from branches.
pride

pride

The social groups formed by lions.

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Date Created:

Feb 24, 2012

Last Modified:

Dec 17, 2014
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