Our long development cycle

My good friend, Mr. E. Victim, sent me this email:

"I was just pondering as I fell asleep the other night: why do we have such a long developmental phase as a species (20 years – an eternity compared to animals!)? Then I stumbled across this article, which suggests we need the time to develop a brain that cannot be larger when born for a species that walks on their two hind legs."

Check out The Benefits of a Long Childhood:
“A big and complex brain takes a lot of time to develop, and in humans much of that development must occur after birth, because bipedalism limits birth-canal width, which has in turn constrained the head size of newborns.”