Eli5: how is it that so many species, including humans, have the same motherly instinct that suddenly appears after birth? Where does this come from?

Question

Eli5: how is it that so many species, including humans, have the same motherly instinct that suddenly appears after birth? Where does this come from?

In: 2

Answer 1

The Three Fs: Fight, flight, and feeding.

Any organism that can’t do all three of these things will have lower offspring survival rate. Yours being an offspring.