The Uganda Museum carries out research across the country, with intensive research in the Karamoja region (Napak, Moroto and Kadam), Eastern Uganda at the foothills of Mount Elgon (Bukwo) and the whole of the western rift to Dellu, near Uganda's border with Sudan. The Paleontological Research Unit has yielded fossils that relate to human evolution. For instance, Uganda Pithecus (fossil skull of a remote cousin of Hominidae) is fossil ape, aged between 19 and 20 million years, that was discovered in Napak. Paleoenvironmental research around heritage sites has also taken place in eastern and western Uganda.