Aquatic Ape Hypothesis

Elaine Morgan's Aquatic Ape Hypothesis, first proposed in 1960, argues that human ancestors underwent a semi-aquatic phase—explaining bipedalism, hairlessness, subcutaneous fat, and our unique diving reflex—but it has been steadfastly rejected by 95% of paleoanthropologists according to a 2021 survey. The hypothesis has zero direct fossil evidence to support it, unlike the accepted savanna hypothesis, which has over 200 fossil specimens from the same period. Yet proponents point to one concrete data point: human newborns instinctively hold their breath and paddle when submerged up to 6 months of age, a reflex absent in chimpanzees and gorillas, which feeds the theory's enduring appeal even as mainstream science dismisses it.