Cheryl-Samantha Owen / Aldabra giant tortoise (Geochelone gigantea) on beach at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Ben Lascelles / Aldabra Giant Tortoise (Geochelone gigantea) head portrait. Mauritius.

Ben Lascelles / Aldabra Giant Tortoise (Geochelone gigantea) head in profile. Mauritius.

Mark Carwardine / Aldabra giant tortoise (Geochelone gigantea) captive, vulnerable, from Aldabra and Seychelles, Bristol Zoo

Loic Poidevin / Aldabra giant tortoise (Geochelone gigantea) pair mating, Curieuse Marine National Park, Seychelles, Indian Ocean

Loic Poidevin / Aldabra giant tortoise (Geochelone gigantea) pair mating, Curieuse Marine National Park, Seychelles, Indian Ocean

Stephen Dalton / Seychelles Giant Tortoise (Dipsochelys dussumieri) walking fast, Seychelles, captive, extinct in the wild

Michael D. Kern / Aldabra tortoise {Geochelone gigantea} close-up profile of head and legs, captive, Aldabra Islands

Pete Oxford / Aldabran giant tortoises (Geochelone gigantea) feeding on 'tortoise turf', Picard Island, Aldabra Atoll, Seychelles, Indian Ocean

Miles Barton / Aldabran giant tortoise (Geochelone gigantea) stretching to feed on leaves on high branch, Aldabra Atoll, Seychelles, Indian Ocean. Taken on location for "Natural World: Seychelles"

Adam White / Aldabra giant tortoise {Geochelone gigantea} walking up beachfrom sea, Mahe, Seychelles 1999

Pete Oxford / Aldabra giant tortoise {Geochelone gigantea} cooling in water, Picard Is, Aldabra, Seychelles