Nick Upton / Eurasian beaver (Castor fiber) entering the River Otter after release. Part of escaped population re-released to the wild following veterinary check ups. Taken on the second day of Beaver releases aft...

Nick Upton / Julia Coats of the Animal and Plant Health Agency releasing Eurasian beaver (Castor fiber) back into River Otter. Part of escaped population re-released to the wild following veterinary check ups. Tak...

Jordi Chias / Juvenile Hawksbill turtle (Eretmochelys imbricata) released by biologist after being tagged, Cayman; Cayman Islands Archipelago.

Cheryl-Samantha Owen / African penguins (Spheniscus demersus) being released after rehabilitation at Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) near Robben Island in Table Bay. Cape Town, So...

Eric Baccega / Scientists of the ONCFS with Common hamsters (Cricetus cricetus) ready for release in a wheat field. Grussenheim, Alsace, France, June 2013 Model released.

D. Parer & E. Parer-Cook / Giant Clam (Tridacna gigas) spawning, Great Barrier Reef, Queensland, Australia

Alex Mustard / A large colony of Mountainous star coral (Montastraea faveolata) spawning at night on a coral reef, showing the synchronous release of bundles of eggs and sperm, East End, Grand Cayman, Cayman Islands...

Ingo Arndt / Common Earthball (Scleroderma citrinum) emitting spores, Germany

Ingo Arndt / Common Earthball (Scleroderma citrinum) emitting spores, Germany

Andy Trowbridge / Split level shot of a fly fisherman (Murray Trowbridge) releasing a large brown trout (Salmo trutta) in a gin clear 'backcountry' river, North Canterbury South Island, New Zealand. January, 2012. Mode...

Cheryl-Samantha Owen / Black footed penguin (Spheniscus demsersus) chick hatching inside a small incubator at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) which collects abandoned eggs fro...

Colin Varndell / Hazel catkins (Corylus avellana) releasing pollen. Dorset, England, UK February