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Pretty much every fish that swallows another fish whole does so head first. Fish swim head first and everything folds backwards: fins, spines, gill plates, etc.; they just go down easier head first.
I agree ... ask any fish biologist and they will tell you the same. They swallow head first 99% of the time. I catch many fish where you can see the tail fin of thier previous meal, like a shad tail sticking out of a bass's throat.