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Post # 1
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Join Date: 20 Sep 2011
Location:  KuwaitPosts: 100 |
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how do birds when its time to migrate? |
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Scientists believe that in some species, young migrating birds learn when and how to migrate from the older birds in the flock. Experts have also noted that changes in the temperature and amount of daylight seem to trigger a migrating impulse in birds. As the days get shorter and the amount of sunlight decreases in the autumn, migrating birds begin to produce hormones. These hormones cause the birds to store up more fat in their bodies, fat that can be converted into energy to help sustain them on their long flights. As the time for migrating approaches, birds display signs of restlessness. Some people have even observed such restlessness among captive birds, which have a steady food supply and little contact with outside temperatures and sunlight. |
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Post # 2
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Join Date: 22 Jun 2011
Location: KuwaitPosts: 448 |
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RE: how do birds when its time to migrate? |
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Hmmmm ...... There is a mistake in the title topic. |
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