What is the colour of earthworms, and why?

Earthworm, terrestrial, cylindrical segmented worm of the class Oligochaeta. There are 2,200 earthworm species, found all over the world except in arid and arctic regions and ranging in size from 1 in. (2.5 cm) to the 11-ft (330-cm) giant worms of the tropics. read more

Some earthworms are pallid in color, many are reddish brown to purple, and one Philippino species is bright blue. But most of the time the colour of the body in earthworm is brown due to the presence of Porphyrin. read more

Genetically, the three pink species are further apart than even humans and orangutans, King says. He suspects that further sampling in Europe may uncover yet more cryptic types of worms, species that look identical but are indeed separate on a genetic level. read more