Zoologist Eugene Morton has propounded a general theory of the vocal sounds that animals make.

动物学家尤金·莫顿提出了一个有关动物发声的通论。

《柯林斯英汉双解大词典》

Ultrasound is used by many animals that detect and some of them send out very high frequency sounds.

许多动物都用超声波来进行侦查，有些动物还能发出非常高频的声音。

youdao

These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.

这些声音包括冰原破碎、水下地震和动物自己发出的声音。

youdao

For animals, certain sounds, such as growling, mean danger.

FORBES: The Man-Machine Framework: How to Build Machine-Learning Applications the Right Way

The campsite volunteers will identify the sounds of animals on the prowl and provide a wealth of information about forest life.

BBC: Mumbai��s urban jungle, after dark

As backgrounds, or you know, also singing and, you know, they use sounds of children and animals and those kind of stuff.

NPR: 'Viva': Diego Urcola and His Dream Band