Eric Baccega / Western lowland gorilla (Gorilla gorilla gorilla) male aged 12 years amongst vegetation. Captive bred in UK and released into wild along with his father in 2013. Gorilla Protection Project managed by...

Eric Baccega / Western lowland gorilla (Gorilla gorilla gorilla) male aged 12 years standing up at edge of Mpassa river. Captive bred in UK and released into wild along with his father in 2013. Gorilla Protection Pr...

David Woodfall / European Beaver (Castor fiber) eating blackberries by standing on its hind legs and using its tail as additional support. Part of captive breeding population prior to release into the Welsh landscape...

Nick Upton / Close up of female captive bred Water vole (Arvicola amphibius) being sexed before release into wild during reintroduction project, Derek Gow Consultancy, near Lifton, Devon, UK, March. Model release...

Nick Upton / Close up of captive bred Water vole (Arvicola amphibius) before release into the wild during reintroduction project, Derek Gow Consultancy, near Lifton, Devon, UK, March.

Nick Upton / Close up of captive bred Water vole (Arvicola amphibius) inside cage in storage room before release into wild during reintroduction project, Derek Gow Consultancy, near Lifton, Devon, UK, March.

Nick Upton / Close up of captive-bred Water vole (Arvicola amphibius) inside cage before release into wild during reintroduction project, Derek Gow Consultancy, near Lifton, Devon, UK, March.

Nick Upton / Close up of captive bred Water vole (Arvicola amphibius) in cage with food, before release into wild during reintroduction project, Derek Gow Consultancy, near Lifton, Devon, UK, March.

Nick Upton / Close up of male captive bred Water vole (Arvicola amphibius) being sexed before release into wild during reintroduction project, Derek Gow Consultancy, near Lifton, Devon, UK, March. Model released.

Nick Upton / Derek Gow inspecting cages containing captive bred Water voles (Arvicola amphibius) in storage room before release into the wild during reintroduction project. Derek Gow Consultancy, near Lifton, Devo...

Klaus Nigge / Plates displaying names of adopted Philippine eagles (Pithecophaga jefferyi), Philippine Eagle Centre, Malagos, Davao, Mindanao, Philippines. Eagles are captive bred as part of a conservation project.

Doug Gimesy / Regent honeyeater captive release project officer, uses a wildlife tracking receiver to find and determine the location of some captive bred Regent honeyeaters (Anthochaera phrygia) that have just bee...