Darwin's Tortoises More Diverse Than He Knew
The giant tortoises of the Galapagos Islands inspired Charles Darwin to formulate his theory of natural selection to describe the evolutionary diversity of species. Now those tortoises have been found to be even more diverse than Darwin knew. Nearly 150 years after Darwin's most important work, scientists have found the tortoise Geochelone nigra, found on the Galapagos island of Santa Cruz, is not one species but three.