Humans have adopted such an extreme form of the peak-late strategy because, as a species, we have come to inhabit an equally extreme ecological niche. The main demands imposed upon us by the odd, crowded cave to which we have adapted can be summed up with what I’ll call the Three Cs: we are required to be creative, cultural, and communal. The demands of the Three Cs make us, like the helpless, blind, altricial crow chicks, more vulnerable than robust and less complicated animals.
