I had a fish that thought it could fly, oops RIP fishy....

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I once had these neat fish. They are the rock like fish that stick to the tanks. Well I had about 8 of them, they are so far the only fish I've manged to keep alive the longest even despite a few errors on my part. Well I started out with an open tank thing but I ended up with a closed one as when I woke up the one day upon counting my fish one was missing, when I looked next to my fish tank it was dead pointing to the tank as if it tried to get back in. I felt sorry for it, but I couldn't do anything about it and wondered why sometimes fish (wasn't the first fish I had to do that) and turtles (I've had turtles do it too) try to jump out their bowls/tanks. Do they believe they can fly? Mistaken identity crisis? Cross breed with flying fish lol?