I didn't realize how big they are! They also aren't really crabs. They are arthropods, closely related to spiders, but even more closely related to the extinct trilobites. This isn't my picture (it came from Miss Pegasus), but it shows what's under the shell of a live one.
There sure isn't much agreement on line about how many pairs of legs they have, but I think the correct answer is 6 pairs. They use the small ones for eating, the next set for mating, and the other 4 sets for walking.
The tail is very important because they can use it to turn over if they get flipped. So a horseshoe crab with a broken tail could be in serious trouble.
I hope I get to see one in real life sometime! I bet lots of you have seen them. They are found around the world, at the ocean.
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