"Boy, I tried to research that question (rape in non-human animals) and found enough violently racist vile evil to turn my stomach twice sideways and once back-to-front. But no evidence of non-human rape. Somebody with better google-fu will have to take over."

Some would argue that rape is a human construct and that animals behaviour cannot be applied to human law. Nevertheless, many animals do get raped.

There are enough charges of humnans having sex with animals. That has to be rape as the animal certainly cannot consent for starters. Lots of female animals get raped by males, both vertebrate and invertebrate, especially where sperm competition can be demonstrated. Mammals, birds, many invertebrates, get raped by males seeking to secure the insemination of the female. She is not always willing but is often the only way she can get rid of the male is to have sex. He then goes and she may get a chance to have a meal of something to increase her fecundity. Randy Thornhill did a rtehr good book on the subject of Animal Coersion and its bases. Coersion is often a eumphamism for rape.

Google Animals + rape + coersion to get to some references

mp