Well here's something you don't see every day.
A rare blue lobster was caught off Prince Edward Island, Canada on Monday.
Experts say only one in about two million lobsters are blue.
According to researchers at the University of Connecticut, a genetic mutation causes the lobster to produce an excessive amount of a particular protein, which combines with a small, red carotenoid molecule known as as astaxanthin.
The two push together, forming a blue complex known as crustacyanin which gives the creature's shell a blue color.