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> >The answer is not at all obvious to me; after all, fish and sea turtles are
> >cold-blooded vertebrates that seem to survive just fine even in very cold
> >ocean waters.
> I don't know much about the range of sea turtles et al, I've always equated
> with tropical waters. Maybe I'm wrong. I seem to recall hearing that some fish
> or mammals have blood with "anti-freeze" characteristics.
Although sea turtles are generally found around the tropics and need a warm
to nest, the main species regularly found in sub arctic waters, the leatherback
(Dermochelys) is endothermic.