"Rape" among animal species
Some animals appear to show behavior which resembles rape in humans, in particular combining sexual intercourse with violent assault, such as observed in ducks and geese.
It is difficult to determine to what extent the idea of rape can be extended to intercourse in other animal species, as the defining attribute of rape in humans is the lack of informed consent, which is difficult to determine in other animals.
However, it is clear that sometimes an animal is sexually approached by another animal and penetrated while it is clear that it does not want it, e.g. it tries to run away. This has led to some people describing forcible penetration in animals as "natural" behavior, with the connotation that rape in humans is also in some way "natural". This is the subject of considerable controversy.
References:
- Gowaty, P.A. and N. Buschhaus. 1997. Functions of aggressive and forced copulations in birds: female resistance and the CODE hypothesis. American Zoologist (in press).