Richard Du Toit / African giant earthworm (Microchaetus rappi) Mountain Zebra National Park, Eastern Cape Province, South Africa.

Jan Hamrsky / Aquatic oligochaete worm (Chaetogaster sp.), Europe, January, controlled conditions

Jan Hamrsky / Aquatic oligochaete worm (Chaetogaster sp.), Europe, January, controlled conditions

Jan Hamrsky / Aquatic oligochaete worm (Chaetogaster sp.), Europe, January, controlled conditions

Jan Hamrsky / Aquatic oligochaete worms (Ophidonais serpentina), among the roots of aquatic plants, Europe, December, controlled conditions

Jan Hamrsky / Aquatic oligochaete worms (Ophidonais serpentina), among the roots of aquatic plants, Europe, December, controlled conditions

Jan Hamrsky / Aquatic oligochaete worms (Ophidonais serpentina), among the roots of aqatic plants, Europe, December, controlled conditions

Claudio Contreras / Southern sea palm (Eisenia arborea) and Giant kelp (Macrocystis pyrifera) forest, San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Claudio Contreras / Garibaldi (Hypsypops rubicundus) and Giant kelpfish (Heterostichus rostratus) among Southern sea palm (Eisenia arborea), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja Ca...

Claudio Contreras / California sheephead (Semicossyphus pulcher) among Southern Sea Palm (Eisenia arborea), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May. Vulnerable...

Claudio Contreras / Black surfperch (Embiotoca jacksoni) among Southern sea palm (Eisenia arborea) and Giant kelp (Macrocystis pyrifera) forest, San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baj...

Paul Williams / Kinabalu giant red leech (Mimobdella buettikoferi) feeding on Kinabalu giant earthworm (Pheretima darnleiensis), on Mount Kinabalu, Borneo