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eBook details

• Title: Our Domestic Birds
• Author : John H. Robinson
• Release Date : January 22, 2010
• Genre: Nature,Books,Science & Nature,
• Pages : * pages
• Size : 10257 KB

Description

A bird is a feathered animal. The covering of feathers is the only character common to all birds and not possessed by any other creature. The other characters—the bill, the wings, egg-laying, etc. —by which we usually distinguish birds from animals of other kinds are not exclusive bird characters. Turtles have beaks, and there is one species of mammal (the ornithorhynchus) which has a bill like that of a duck. Many insects and one species of mammal (the bat) fly. Insects, fishes, and reptiles lay eggs, and there are several rare species of mammals that lay eggs and incubate them. On the other hand, some birds are deficient in one or more of the typical bird characters. The ostrich cannot fly. The penguin can neither fly nor run, and cannot even walk well. The cuckoo lays its eggs in the nests of other birds, leaving to them the hatching and rearing of its young. These exceptional cases are very interesting because they show that animals now quite different in structure and habits had a common origin, but in no case is there such a combination of characters that any doubt arises whether the creature is a bird or a mammal.

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