Cassell's Book of Birds, Reading 1
Boring Books for Bedtime Readings to Help You Sleep
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Birds and the Feathered Race
The quickness of sight with which birds are gifted is equally remarkable. Nae Moore, anyone who attentively watches one of these birds skimming over a meadow, may perceive that it will capture two or even three insects in such quick succession as to convince him that the swallow must have had an eye upon them all at once. Another admirable contrivance peculiar to the feathered race is the existence of a thin, semi-transparent veil which, when requisite, can be instantaneously drawn over the front of the eye. This apparatus, generally known as the nictitating membrane, is useful for a variety of purposes. The commodious manner in which this membrane lies folded up in
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