When pets go wrong

Matt Holck · 01-12-2006 2:43am

The male cat's penis has spines which point backwards. Upon withdrawal of the penis, the spines rake the walls of the female's vagina. The female needs this stimulation for ovulation to begin. Because this does not always occur, females are rarely impregnated by the first male with which they mate. Furthermore, cats are superfecund; that is, a female may mate with more than one male when she is in heat, meaning different kittens in a litter may have different fathers.

The reproduction process can be very loud, as both cats vocalize loudly. If one is not used to the sounds of cats mating, it will sound like a cat fight.

http://en.wikipedia.org/wiki/Cat