Titlebook: Ultrasonic Communication by Animals; Gillian Sales,David Pye Book 1974 G. D. Sales and J. D. Pye 1974 acoustics.animals.behavior.biologica

疲惫的老马

Etching

What is Ultrasound?, study of communication by animals has increased rapidly and some fascinating phenomena have been revealed through the development of methods for studying both the communication signals of the animals and also the capabilities of their sense organs. In addition the rapid development of techniques fo

红润

limber

倔强不能

两栖动物

Barter

Other Insects, methods are also used. Dumortier (1963a) summarized the methods of sound production in insects as (1) friction of differentiated parts as in tettigoniids, crickets and grasshoppers, (2) vibration of membranes, for example the buckling of tymbal organs in cicadas and some moths, (3) the expulsion of

上下连贯

悲痛

Other Vertebrate Groups,r ultrasonic, was discussed in Chapter 3. This ability is not confined to bats, however. Echo-location using audible cries has now been demonstrated in two genera of birds and in porpoises, while the dolphins use wide-band signals extending into the ultrasonic range. An echo-location function has al

集合

Review and Speculations,unds are used for auto-communication or echo-location in cetacea and bats and possibly other small mammals, and they are apparently important in social behaviour in rodents and insects. They are also used in interspecific communication between bats and those moths that are able to detect the ultraso