Michel Roggo / Watermilfoil (Myriophyllum spicatum) with some stems supporting clusters of Zebra mussel (Dreissena polymorpha) Lake Neuchatel, Switzerland. Highly commended in the Plants category of the Wildlife Pho...

Linda Pitkin / 2020VISION / Freshwater pearl mussels (Margaritifera margaritifera) on river bed, Ennerdale Valley, Lake District NP, Cumbria, England, UK, October 2011

Neil Bromhall / Bitterling {Rhodeus sericeus} laying eggs into mussel, Europe

Remi Masson / Freshwater pearl mussel (Margaritifera margaritifera) on riverbed, Morvan Regional Nature Park, France, August. Endangered species.

Jussi Murtosaari / Freshwater pearl mussel (Margaritifera margaritifera), is an endangered species of freshwater mussel, Finland, March.

Jussi Murtosaari / Freshwater pearl mussel (Margaritifera margaritifera) pearls, Finland, March.

George Sanker / American red squirrel (Tamiasciurus hudsonicus) chewing on freshwater mussel shell, Acadia National Park, Maine, USA

Jan Hamrsky / Swan mussel (Anodonta cygnea), Europe, August. Controlled conditions.

Jan Hamrsky / Swan mussel (Anodonta cygnea) burrowing into the sand, Europe, August. Controlled conditions.

Jan Hamrsky / Swan mussel (Anodonta cygnea) burrowing into the sand, Europe, August. Controlled conditions.

Jan Hamrsky / Swan mussel (Anodonta cygnea) burrowing into the sand, Europe, August. Controlled conditions.

Jan Hamrsky / Solid orb mussel (Sphaerium solidum), Europe, July. Controlled conditions.