When looking through the 80 "Beagle" images at Acclaim Images.com this Giant Galapagos Tortoise was a favorite.
All of their pictures are hand picked, availiable in a number of formats, and you can even get custom prints and posters.

Description:
Giant Galapagos Tortoise
A stock photo in horizontal format showing a close-up view of a giant tortoise, geochelone elephantophus, on the Galapagos island of Santa Cruz

Some related terms for more images:
ecuador,  galapagos,  giant tortoises,  geochelone elephantophus,  reptiles,  south america,