V.hb - you like contradicting me, don't you? At any rate, what he THOUGHT he knew was either not much or incorrect. It happens, but what was I supposed to say "You're entirely correct! I'll go tell the scientists that Dolphins are actually insects"?
And by the WAY, I didn't have to look in a book or search on yahoo to find that information. (however I did take a quick look to check my facts)
Dom - many fish who live in sub-zero waters produce some heat of their own. For example Sharks can be considered warm blooded. Their blood temperature is quite a bit higher than the temperature of the water surrounding them. However I don't know if friction caused by moving fast could be considered warm blooded, because it's not the body generating it's own heat, you know? :P