The ultimate urge - to reproduce and pass on our genes. For some however, it is a fatal desire?
Here a female Polyspilota sp. mantis from Madagascar is chewing off the head of a male while mating with him.
So from some of the experts in the crowd...
What evolutionary advantage is there in the death of the male?
Less resource competition (mating and future competition with the young for food)?
Elimination of a potential predator of the young?
(Thanks to artour_a at flickr for the excellent photo!)