There are three species of Giraffe at 1.8 million years in the Turkana Basin. Giraffa jumae is the largest, Giraffa stillei is intermediate and Giraffa pygmaea is the smallest. Although Giraffa stillei is the most common of the three Giraffes at Lake Turkana, a complete skull has not yet been recovered for this species.
This specimen was found in 2008 by fossil hunter Arbollo and is a right mandible with teeth (4th premolar through to the M2).
Giraffe evolution has been shaped very much by their diets. The long neck and legs of modern giraffes allows them to browse vegetation that other animals can not reach. Some of the early giraffes displayed similar adaptations however isotope studies of their teeth show that they had a wider variation in their diet.