Lumbricus

Lumbricus terrestris is a large reddish worm native to Europe, but now also widely distributed elsewhere around the world (along with several other lumbricids), due to human introductions. In some areas where it has been introduced, it is a serious pest species, out-competing locally native worms.

Through much of Europe it is the largest naturally occurring species of earthworm, typically reaching 20-25cm long when extended (though in parts of southern Europe there are native species which are much larger). It has an unusual habit of copulating on the surface at night, which makes it more visible than most other earthworms.