Aporrectodea calignosa (also known as
Allolobophora similis or the
grey worm) is an earthworm commonly found in Great Britain. It is recognizable by the three distinct shades of colour at its front end, and it is 6 centimetres (2.4 in) in length when not moving. Its saddle pads usually form a two humped ridge across three segments along the length of the saddle, however this is not clearly visible. The worm mostly lies in non-permanent horizontal burrows...
(Wikipedia)