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The Crabs come from China. They are called Mitten Crabs because they have furry claws in the front. We never found out why they have furry claws, if they need them to stay warm or anything.

It first was found in Germany in the 1930s. It has also been found in New Zealand and other places.

We don't know if China knew the crabs were moving around. We don't know why they didn't do anything to stop it. We don't know why the crabs didn't die from eating the things in a new place. The male crabs have bigger mittens than the females. It's easy to tell the males from the females. The crab stomach has lines and the male stomach is narrow and longer. The female belly is like a square, the same length and width.