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1

I think that there are too many examples of animals being deliberately quiet when grazing to count. I'll discuss specifically the exceptions you raise and how they are exceptional. Hopefully you'll see my point: A lot of grazers are quiet and cautious or failing that have other adaptive strategies for not being eaten. Deer are incredibly quiet and cautious ...


3

Does soundproofing count? Most predators locate prey using visual or olfactory cues; the only predators I can think of that use auditory cues are nocturnal ones - owls and bats. Bats, of course, use echolocation, so even completely silent prey are still detectable. It has been suggested that the soft, fur-like body coverings of some owlet moths (Noctuidae) ...



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