Sissy, my passion and pride for these guys is what prompted such a lengthy answer..
I suspect what occurred with your case is the animal did not recieve the bonding that occurrs here with our babies..Animals are put into a groove by the way we keepers keep them..IMO..
If their needs are met and exceeded they go on to perform as such..If they are not, then they do not respond as a keeper would wish..Again IMO..