Jan Hamrsky / Scud or side-swimmer (Gammaridae), freshwater crustacean, November, Europe, controlled conditions

Jan Hamrsky / Scud (Gammarus fossarum), a freshwater crustacean, feeding on dipteran larva, Europe, February, controlled conditions.

Jan Hamrsky / Scuds (Gammarus fossarum) mating, freshwater crustaceans. Europe, February, controlled conditions.

Alex Hyde / Estuarine Sand-shrimp (Gammarus duebeni)found at water edge in estuary, photographed on a white background in mobile field studio. The male carries his chosen female for several weeks until she sheds...

Alex Hyde / Estuarine Sand-shrimp (Gammarus duebeni)found at water edge in estuary, photographed on a white background in mobile field studio. The male carries his chosen female for several weeks until she sheds...

Jan Hamrsky / Scud (Gammarus fossarum) freshwater amphipod crustacean, Europe, June, controlled conditions