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    You don’t see many birds in winter. Most have left your area. Those that stay are
    not as active. Activity uses energy that is needed to keep warm.
    The worst problems for birds in winter are getting enough heat and holding on to
    the heat once it is made. These are problems for all birds. But it is especially true
    for very small ones. They cannot find enough food. The weather stays so cold for
    so long that they cannot eat enough to keep alive. But birds have many ways of
    fighting the cold.
    You shiver to keep warm. The heat that you make is made mostly in your muscles.
    The muscles make more heat when they are active. So one way of keeping warm is
    to move about, use your muscles. Another way is to shiver. When your body needs
    heat, the muscles tighten and loosen quickly. They become active. Just as you
    shiver to keep warm, so do birds.

Ответы 2

  • 1 do berds leave our country2 what season birds leave our country3 have a very small birds with holding on the heat4 can they find enough food in winter5 What problem do birds have in winter6 what way do you know to keep warm7 What does  make heat when we are active
  • Do you see many birds in winter?Are these birds, that stay around as active In winter ? Why? Can birds find enough food? Is the weather good for birds?What ways have these birds to fight with cold?
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