He fell from the trees but did not strike bottom.

He gibbered with fear at the roaring of the lions.

He was pursued by beasts of prey, struck at by deadly snakes.

He chattered with his kind in council, and he received rough usage at the hands of the Fire People in the day that he fled before them.
But, I hear you objecting, why is it that these racial memories are not ours as well, seeing that we have a vague other-personality that falls through space while we sleep?
And I may answer with another question.

Why is a two-headed calf?
And my own answer to this is that it is a freak.