• Their relationship to humans is irrelevant to being able to walk around just fine on two legs.

    My last point was apes fit the “featherles biped” just as much as a plucked chicken, and just as much as we do.

    It really just depends on how much knowledge they had of the existence of various primates and how they walk around. I’ve just seen enough monkeys and apes walking on two legs to consider them a child’s understanding of “featherless biped”

    My favorite bit of trivia about how much/little we knew about things, we technically discovered steam power thousands of years ago, but only relatively recently in human history figured out how to use it to do things.