I know this has already been addressed in this thread, but I'll emphazise this point (as I'm a marine biologist)--you can find "dolphines" all over. In cold and warm waters. I live in Southern California (near the channel islands), and we have some of the highest densities of dolpines you'll find anywhere in the world--and the water isn't warm here. Water temp. has nothing to do with their distribution. Food dictates their distribution--and of course you find different species in different habitats.
Anyway, lecture over. Besides, I study marine invertabrates, so I actually know very little about marine mammals. Just enough to be dangerous.
Cheers,
I have some ships to sink.
J
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