Jan Hamrsky / Brine shrimp or monkey shrimp (Artemia salina) female. Controlled conditions.

Solvin Zankl / Fairy Shrimp (Eubranchipus grubii) eggs Digital focus stacking image

Piotr Naskrecki / Eastern Fairy Shrimp (Eubranchipus vernalis) in vernal pond, Estabrook Woods, Massachusetts

Nick Upton / Great crested newt (Triturus cristatus) male courting a female by arching his back and waving his tail in a garden pond at night, surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, M...

Nick Upton / Great crested newt (Triturus cristatus) male in a garden pond at night, surrounded by Water fleas (Daphnia pulex), Mendip Hills, near Wells, Somerset, UK, March. Photographed under license.

Nick Upton / Two male Palmate newts (Lissotriton helveticus) swimming in a garden pond at night surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, March.

Nick Upton / Palmate newt (Lissotriton helveticus) male in a garden pond at night with webbed hind feet spread wide, surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, March.

Nick Upton / Two male Palmate newts (Lissotriton helveticus) swimming in a garden pond at night surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, March.

Piotr Naskrecki / Fairy Shrimp (Branchipodopsis sp), Gorongosa National Park, Mozambique

Floris van Breugel / Brine shrimp (Artemia) the only other plentiful animal that survives under water at Mono Lake. Mono Lake, California, USA.

Nick Upton / Pair of Great crested newts (Triturus crustatus) and a Palmate newt (Lissotriton helveticus) swimming in a pond, surrounded by Water fleas (Daphnia pulex), Somerset, England, UK, February. Filmed at...

Nick Upton / Male Great crested newt (Triturus crustatus) displaying to a female in a pond, with another female swimming past feeding on Water fleas (Daphnia pulex), Somerset, England, UK, February. Filmed at nig...