Crabs are a universal constant. So much so that they are used in first contact. Earth is strange for the amount of crab types that we have. Keep them away from the Japanese spider crab though. The first alien to see one said it was the equivalent of an eldrich monstrosity.

Sorry, but the correct place to post a prompt for my daily flash fictions is over here: https://www.internutter.org/bb/category/6/prompts

I have, however, added this to my queue of prompts [currently standing at 84 prompts in the queue] on your behalf, properly credited.