Ellsworth Wareham after the first such procedure was performed. Leonard Bailey, the surgeon who transplanted a baboon heart into a baby at Loma Linda University in 1984, trained under Wareham as a medical student in the late 1960s. The child, Baby Fae, was born prematurely with hypoplastic left heart syndrome and Bailey’s surgery made international headlines. Loma Linda, Wareham's home town has been described as USA's only Blue Zone, an area where the longevity is appreciably higher than the national average and one of the four places in the world to have a substantial proportion of humans live past 100 years. The
Baboon as a full species, but regard all the others as subspecies of "P. cynocephalus" and refer to them collectively as "savanna baboons". This may not be helpful: it is based on the argument that the hamadryas baboon is behaviorally and physically distinct from other baboon species, and that this reflects a separate evolutionary history. However, recent morphological and genetic studies of "Papio" show the hamadryas baboon to be more closely related to the northern baboon species (the Guinea and olive baboons) than to the southern species (the yellow and chacma baboons). In 2015 researchers found the oldest baboon fossil dating