some animals that live in groups where the leader gets to do all the mating, if a new leader emerges, he will kill all the offsprings of the old leader. i'd sa

some animals that live in groups where the leader gets to do all the mating, if a new leader emerges, he will kill all the offsprings of the old leader. i'd say that this is a clear sign that animals do have strong biological drive to care about continuing their bloodline