http://worldcat.org/entity/work/id/21451278

A handbook to the swallows and Martins

This reference guide gives general details about the swallows and martins of the world. These include appearance, the basic coloration and differences between the sexes and immatures and the function of other areas of colouring. Several species within the same geographical area are often segregated by feeding in different habitats or at different heights or by eating different size-classes of insects. The two sub-families, one being the two river martins, the other containing about 72 species mainly in the genus hirundo, are dealt with, including their distribution and migration patterns. Feed.

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