On page 117 I made the comment: "Homo erectus (and Homo ergaster) were the first species that habitually walked upright and the first that could run long distances." The intent here was to distinguish Homo Erectus from Australopithicus, as Homo Erectus/habillus had evolved sophisticated physiological and neurological mechanisms--similar to Homo sapiens--that allowed them to run long distances. Of course, the process was slow and continuous. What I should have said was "Homo erectus (and Homo ergaster) were the first Homo species to evolve fully developed mechanisms for running long distances similar to our own Homo sapiens species."