
The SciencesAugust 1, 1973
Duet-Singing Birds
The male and female of certain tropical species join each other in remarkably precise song. The primary function of this behavior is to maintain close communication between the birds in dense foliage

Duet-Singing Birds
The male and female of certain tropical species join each other in remarkably precise song. The primary function of this behavior is to maintain close communication between the birds in dense foliage

The Language of Birds
The songs and other calls of birds are not merely joyous outbursts. They make up a complex communications system, with the various sounds suited to various types of message

Dr. Johnson on Aeronautics