She came from the Gladys Porter Zoo in Brownsville, Texas, where she was born Jan. 29 to a first-time mother who showed little maternal instinct.

NPR: Grunting Ohio Zoo Workers Act As Moms To Gorilla

This can destabilize the marriage: When his mother and his wife are battling, a man's self-preservation instinct tells him to hide.

WSJ: Getting Along With the Original Other Woman��Your Mother-in-Law

It is a vivid and, at times, moving story of one woman's lonely and dogged fight against the painfully limited expectations of her own gender embodied by her own mother, the unquestioning prejudice of most men of her age and the suffocating instinct to patronise of those who have inherited their positions rather than earned them.

BBC: The Iron Lady