Hmm... Snopes says 'probably not' or at most some isolated incidents on Réunion Island.
http://www.snopes.com/critters/crusader/sharkbait.asp
AFAIK neither sharks not 'gators have the intellect to have a favoured food list, if it moves, they'll eat it. Unless they're not hungry of course.
Cain't comment on snopes. But experience says it happens.
Perhaps "favored" food is a bit of a strech for gators. They will attack and eat anything in the right size range and proximatey to the water or it's edge. When humans are around that usually means dogs and/or children. While attacks on humans have been rare while I've been here (statewide) the number of dogs killed by them has been aroound 3-6 per year (and that's just locally) There's one particular gator up on Ft. Rucker's rec area that always comes out to follow us (he stays just in the water swimming parallel to where we walk) watching the dogs when we have them. If the dogs aren't present he stays well offshore and ignores us.
Arrests for using puppies as bait are frequent enough that the local animal shelters and Florida Fish And Wildlfe Conservation Commission post warnings against giving away pups. And apparently sharks DO indeed have "favored" foods. It's believed (ironically) that seals are on that list. That's apparently why attacks on surfers have increased since the shift to shorter boards. The belief is that the sharks look up and mistake the short board on the surface as a seal. Once they bite into in (and/or the surfer) and discover the mistake they release it. For that matter it would appear that most attacks on swimmers are some form of mistaken identity as they rarely ever eat them either. Usually it's bite and release.
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