Subject: whale blowholes

Leah Gerber (leah@fish.washington.edu)
Fri, 27 Mar 1998 11:28:30 -0800

At 10:31 AM 3/19/98 EST, you wrote:
>Why do some whales have two blowholes??????
>

Hi,

Most mammals, even ourselves, have two nostrils. The blowholes of whales
are their nostrils, leading to their lungs. The baleen whales all have two
blowholes as do all of their land mammal relatives. The toothed whales,
however, have only a single exterior blowhole. This is because the second
air passage-way has evolved into a sonar/sound production mechanism which
toothed whales use to orient themselves, locate and catch food, and
communicate.

Leah