Spotted hyena cubs mounting adults.
Okay, the spotted hyena is quite well known by the particularities of the female anatomy and the reproduction, for more info's check http://www.geocities.com/hyaenaresearch/IntrotoSpottedHyaena.html for example.
But the amount of male hormones on alpha females, e.g. when they're pregnant, have some consequences on the behavior of male cubs of the alpha females: see http://www.livescience.com/animals/060426_hyena_cubs.html :
After studying hyenas in Kenya for nearly two decades, researchers discovered that in the final stages of pregnancy, high-ranking females provide their developing offspring with higher levels of androgen - a male sex hormone associated with aggression - than lower-ranking mothers provide to their developing young. (...) Since the sons of alpha females are born hyper-aggressive, they start trying to mount females at just a few months old, giving them a better shot at sealing the deal later in life.
Weird enough to be WTF'ed.
But the amount of male hormones on alpha females, e.g. when they're pregnant, have some consequences on the behavior of male cubs of the alpha females: see http://www.livescience.com/animals/060426_hyena_cubs.html :
After studying hyenas in Kenya for nearly two decades, researchers discovered that in the final stages of pregnancy, high-ranking females provide their developing offspring with higher levels of androgen - a male sex hormone associated with aggression - than lower-ranking mothers provide to their developing young. (...) Since the sons of alpha females are born hyper-aggressive, they start trying to mount females at just a few months old, giving them a better shot at sealing the deal later in life.
Weird enough to be WTF'ed.