The argued degree of human aquaticism varies amongst proponents; however the vast majority, including Morgan, argue a semiaquatic ape on par with e.g. hippos and sea otters, as opposed to a fully aquatic stage on par with e.g. whales or pinnipeds. Some pseudoscientific and cryptozoologic speculations have made use of parts of the AAH argumentation, e.g. the claimed existence of mermaids,[22][23] but this is rejected by AAH proponents, including Morgan.[19]