If there’s one thing that any lobster lover knows for sure, it’s that this crustacean is absolutely delicious — especially when paired with warm, melted butter. Other than that, most of us don’t know much about this bottom-dweller of the sea. And there might be a reason for that.

A bit of research on lobsters reveals that they have a bizarre past and are known to exhibit some unique behaviors (for instance, they pee from their faces). Intrigued? Read on to learn nine strange facts about the crustacean in honor of National Lobster Day.

via Lobsters Pee From Their Faces And 8 More Facts About Our Favorite Crustaceans.