There are two species of weevers found in the North Sea: the greater and lesser weever. The greater weever can grow to 40 centimeters. The lesser weever doesn't grow any longer than 16 centimeters and is found in much greater numbers close to the coast. Both species are benthic fish, mostly active in the evening and night and burrow themselves into the sand during the day. They eat small crustaceans and small benthic fish.