He's actually a Green Sea Turtle (Chelonia Mydas). From wikipedia, Chelonia Mydas "is a large sea turtle of the family Cheloniidae. It is the only species in the genus Chelonia. Its range extends throughout tropical and subtropical seas around the world, with two distinct populations in the Atlantic and Pacific Oceans. The common name comes from the usually green fat found beneath its carapace."
Photo by Alexander Vasenin
Green Sea Turtles are also endangered. To learn more or to help out Hurdle's buddies, check out the World Wildlife Fund's site here.
2 days to go until Hurdle Turtle 2 is released on Xbox 360!