We humans are first animals, then mammals, then primates.
The evolution of a species is linked to the environment.
Ernst Mayr reduced all the hominid (human ancestor: (see hominid books)) fossil records to three species, A.
africanus (Dart, 1925) (including small brained australopithecines) (see books), H.
Mammals and subsequently humanity may not have become dominant on earth had it not been for the global catastrophe that led to the extinction of the dinosaurs 65 million years ago.
Living orders of placental mammals , be it bats, humanity, whales or camels, have as their common ancestor a small insectivore creature that went through a major phase of adaptive radiation during the Early Cenozoic Era .