However, a very simple trap can be used to catch large groups of crab. Here’s how it works. Inside each open-top trap sits a pile of crab feed. The first crab to happen upon the feed enters and enjoys the spoils. The second crab sees his feasting colleague and joins him for the partaking. The third and fourth crabs follow suit. Soon, dozens and dozens of crabs have entered the trap and linger, even after all the food is gone. Here’s the catch. If one crab chooses to exit the cage and look for food elsewhere, it is challenged by its mates. While trying to crawl out of the trap, the other crabs
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