It would still be wrong to kill your fellow man in order to eat him even in desperation.
But you said some animals would kill their young others would not.
You are able to see an inconsistency here between two species of animals.
The alligator would kill his young, the wolf would not.
Are you saying the wolf becomes the standard for the human?
I would argue wolfish characheristics and human characheristics are too inconsistent to compare.