Adults average about 24 inches (7.3 meters) long and are relatively thick-bodied. Black or European adders are usually gray or reddish brown, though they can also be black, white, cream or pale yellow. Adders have a V shape on their heads and scales that partially cover their eyes, giving them a lidded appearance.

What length is an adder?

Adders can grow to around 60cm in length and have rather a stocky appearance.

How long are UK snakes?

Up to 65cm long. Both males and females usually have a dark zig-zag marking along the back and a dark coloured 'V' on the head.