Grass snake:
Dark green / olive colour with dark dotted scales running down the body.
Yellow collar around the back of the head. Vibrant in younger snakes, duller in older ones.
Orange eye with a round pupil.
No V on back of head, like the adder.
Adder:
Females are brown, with a darker brown zig-zag pattern running the entire length of the body. Whereas the male adder is grey with a dark, almost black zig-zag.
Red eye with a vertical pupil.
Has a V on back of the head.
I will post a photograph soon of the adder and grass snake together.

Rob
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