rape cases in bird
<1> Female White-fronted Bee-eaters (tunnel-nesting African birds) leaving their nesting burrows must avoid pursuit by unmated males who may force them to the ground and rape them. Furthermore their unwelcome attentions are preferentially against females who are laying eggs and who thus might lay the eggs of their rapist rather than their mate.[4]
^ Emlen, S. T. & Wrege, P. H. (1986), "Forced copulations and intraspecific parasitism: two costs of social living in the white-fronted bee-eater", Ethology 71 (1): 2–29, doi:10.1111/j.1439-0310.1986.tb00566.x.
http://en.wikipedia.org/wiki/White-fronted_Bee-eater
<2> Rape happens to one-fifth of female White-fronted Bee-eaters. (Extreme Birds: The world's most extraordinary and bizarre birds, 2008, Dominic Couzens, p.193)
<3> Rape, a sexual form of aggression, was observed in some animals. Biologists have noted forcible rape in orangutans, dolphins, bighorn sheep, seals, wild horses, and some birds.
Among waterfowl such as mallards, teal and pintail, an unwilling female is at times pursued by one or more males, which can cause her death by drowning when numerous males try to pile on. She would fight back and flee, and her mate would try to drive away the aggressors, but their efforts at defense don't always succeed. Additionally, the male of a pair of mallards will sometimes try to mate with the female immediately after a rape attempt by another male. These mating attempts might not be preceded by the normal mutual displays of mated pairs. In most such cases the female evidently struggled, but in no case did she take flight. The socio-biological explanation for such marital rapes is that it affords the mate's sperm a better chance of competing with the rapist's sperm. It sheds no light on how the male or female birds feel. Nor does such conduct furnish any evidence whatsoever that human rape is "natural," biologically determined, or reproductively advantageous. Read more: http://www.bukisa.com/articles/574327_rape-in-the-animal-world#ixzz1jDdl2Fyk
Read more: http://www.bukisa.com/articles/574327_rape-in-the-animal-world#ixzz1jDcs9rry
<4> A Natural History of Rape: Biological Bases of Sexual Coercion. Randy Thornhill & Craig T. Palmer A Bradford Book; 1 edition (May 1, 2001)
http://www.amazon.com/Natural-History-Rape-Biological-Coercion/dp/0262700832
http://books.google.com/books?id=xH6v-nB6EegC&printsec=frontcover#v=onepage&q&f=false