Originally posted by Mango:
Ummm...he's probably like one of those sealy-sea-lion thingies with little holes in his head that no one can see.
Actually, Mango, sea-lions do
have external ears. It's one of the things that differentiates sea-lions from other seals.
But basically, I think that you're correct. Plenty of animals lack external ears: birds, reptiles, amphibians, etc. In fact, I think having external ears might just be a mammal thing. Of course, some mammals lack them too. Dolphins, whales, and seals (other than sea-lions
) manage to hear just fine without them. Dolphins and whales even navigate by sound. The fact that sound travels well through water probably helps.
Hey, Zoidberg is a sea creature too. Hmmm...