No. 50: Mar-Apr 1987
This item adds another facet to the Aquatic Ape Hypothesis:
"Humans may have first walked upright because they had to carry the baby -- not because it was born less developed than other primates, but because its parents were ex-aquatic apes."
(Morgan, Elaine; "Lucy's Child," New Scientist, p. 13, December 25, 1986.)