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VBLg8 TIL Lobsters (and crabs) pee out of their heads
R7mm8 TIL lobsters communicate by peeing in each others' faces.
wLkb6 TIL that lobsters have bladders on either side of their heads, so they communicate by urinating at each other. If they want another lobster to know that they’re happy or sad or angry or interested in a relationship, they say it with pee!