Word: fats
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Dates: during 1892-1892
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...fourth, those that pass through in the migrations; and fifth the stragglers. Naturalists have never been able satisfactorily to explain the regular migrations of birds. It does not seem probable that they are influenced by cold as they are so well protected by their thick covering of feathers and fat, and by a very rapid circulation. Then many of the most delicate birds spend the winter in the north and suffer no ill effects. Some naturalists explain it by saying that these migratory birds originated in the north and were driven south by the cold waves of the glacial period...