Physical 

 L. marinus Is one of the largest gulls, growing up to 30 inches in size.  It has a black back and wings, a white body and head, and a yellow bill with a red spot.

Habitat

The Greater Black-backed Gull is located around coastal beaches and estuarine areas along the Atlantic coast.    Also due to human interference, they are found in populated areas where there is a chance of food. These are the common gulls of the beaches and parking lots.  They winter in the mid-Atllantic south to Florida.

Feeding 

These gulls  primarily eat small fishes, crabs, shellfishes, small ducks, and even the young of other gulls. These aggressive birds also eat food that humans feed them or discard at  beaches and parking lots.