Pete Oxford / Galapagos Giant Tortoise (Geochelone elephantophus / Chelonoidis nigra) head portrait, Charles Darwin Research Station. Puerto Ayora,Santa Cruz Island, Galapagos, endemic

Pete Oxford / Finch specimens at the Charles Darwin Research Station, Puerto Ayora, Santa Cruz Island, Galapagos Islands, L to R Top: Large Ground Finch (Geospiza magnirostris), Woodpecker Finch (Cactospiza pallidu...

Pete Oxford / Finch specimens (Emberizidae) at the Charles Darwin Research Station, Puerto Ayora, Santa Cruz Island, Galapagos Islands

Tim Laman / Galapagos giant tortoise (Geochelone nigra / Geochelone elephantopus) feeding (captive). Charles Darwin Research Station, Santa Cruz Island, Galapagos Islands.

Tui De Roy / Pinta Island Galapagos Tortoise (Chelonoidis nigra abingdoni), Lonesome George, the last survivor of his race, Darwin Reserve Station, Santa Cruz Island, Galapagos Islands, Ecuador

David Fleetham / Young boy taking photo of Galapagos giant tortoise (Geochelone elephantopus) at Charles Darwin Research Station in Puerto Ayora, Santa Cruz Island, Galapagos, Ecuador. Model released.

Inaki Relanzon / Espanola giant tortoise (Geochelone hoodensis). Previously extinct on Espanola Island, they are now being reintroduced from the Charles Darwin Research Station and Breeding Center, Santa Cruz, Galapa...

Inaki Relanzon / Espanola giant tortoise (Geochelone hoodensis) showing saddle-shaped shell. Previously extinct on Espanola Island, they are now being reintroduced from the Charles Darwin Research Station and Breedin...

Inaki Relanzon / Espanola giant tortoise (Geochelone hoodensis) showing saddle-shaped shell. Previously extinct on Espanola Island, they are now being reintroduced from the Charles Darwin Research Station and Breeding...

Inaki Relanzon / Espanola giant tortoise (Geochelone hoodensis). Previously extinct on Espanola Island, they are now being reintroduced from the Charles Darwin Research Station and Breeding Center, Santa Cruz, Galapag...

Inaki Relanzon / Espanola Giant tortoise (Geochelone hoodensis), previously extinct on Espanola Island, it is being reintroduced by the Charles Darwin Research Station's Breeding Center, Santa Cruz, Galapagos Islands.

Inaki Relanzon / Espanola Giant tortoise (Geochelone hoodensis) showing saddle-shaped shell, previously extinct on Espanola Island, it is being reintroduced by the Charles Darwin Research Station's Breeding Center, Sa...