Human ancestors lived in warm & water-rich milieus.

* Aquatic Ape Theory of human evolution (original term E.Morgan 1982)
* Aquarboreal Apes Theory of Mio-Pliocene apes (aqua=water, arbor=tree)
* Amphibious Ancestors Theory of Plio-Pleistocene Homo (AAT strict sense)

AAT s.s. is based on comparisons of the behavior-anatomy-physiology-DNA of living humans with chimps & other animals. Waterside collection of coconuts, fruits, bird eggs, turtles, shell-, crayfish, waterplants... explains unique Homo traits (not in apes & australopiths) better than plains- or forest-dwelling: brain size, diving skills, breath control, vocality, small mouth & chewing muscles, tongue bone descent, longer airway, projecting nose, poor sense of smell, handiness, tool use, late puberty, long legs, aligned body, poor climbing, plantigrady, midfoot lengthening & toe shortening, fur loss, fatness, profuse sweating, high needs of water, sodium, iodine & poly-unsat.fatty acids...

Homo & Pan split ~6-4 Ma.