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There aren't any, unless you believe in Bigfoot.

___________________________________________________________________ "Bipedalism is not a trait that uniquely evolved in humans but has occurred in five different instances among vertebrates. Twice it evolved in reptiles, first in thecodonts-the reptilian ancestors to crocodiles, birds, and dinosaurs-and second in lizards, such as the Callisaurus draconoides (a.k.a. zebra-tailed lizard). Birds could represent another instance of bipedalism but it is commonly believed that they evolved from dinosaurs. Finally, there are three instances of bipedal evolution in mammals: the marsupial ricochet form (kangaroos), the placental ricochet form (kangaroo mice), and primates and humans with their alternating gait (Snyder 1962)." - http://www.philosophistry.com/static/bipedalism.html

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16y ago

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