A rare blue lobster was found in an order placed by a U.S. restaurant called Arnold's Lobster and Clam Bar, in Eastham, Massachusetts earlier this week.

A rare blue lobster, caught in the Atlantic and delivered to Arnold's Lobster & Clam Bar on Cape Cod, is seen here, July 11, 2019. [Photo: IC]

Restaurant owner Nathan Nickerson plans to keep it on display at the restaurant for another week until he donates it to an aquarium.

According to a study of University of Maine's Lobster Institute, a blue lobster can be found in 1 of every 2 million. Lobsters are usually reddish brown or greenish brown. However, a genetic defect can cause them to overproduce a particular protein and eventually turn into blue lobsters.