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Коллектив — Интерактивный тренинг. Подготовка к ЕГЭ. Английский язык (2009)
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.
Интерактивный тренинг. Подготовка к ЕГЭ. Английский язык | Скачать бесплатно
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.