https://en.wikipedia.org/wiki/Aquatic_ape_hypothesis From what I understand the mainstream science does not consider the AAT to be valid mostly because of lack of evidence. But has the AAT been disproved? I mean it seems to be quite easy. For example: The theory requires our ancestors to be near water. Therefore if we found fossils of several transitional species from that time that are far enough from any body of water it would be quite conclusive proof. The AAT doesn't seem to be typical pseudoscience, and it looks like it provides a lot of testable claims.