I wonder if these are the same crabs I saw on Survivor Man. Its a show I think on Discovery where they drop this guy off on remote places and survives and has to rondevue with his crew in about a week and he's not the guy name Bear. Anyways he was dropped off at the plains of Africa and found a small crab in a puddle. He ofcourse cooked it over a fire. It was a tiny one though, maybe an inch or two.