Spider cannibalism

Spider on top is male spider
dead and below is female.

Recently I encountered a special case which probably many of have heard for only few times, Spider cannibalism. Spider cannibalism is a case where female spider kills male spider after mating. She consumes male spider and get the nutrition or energy to raise the offspring (children).

You may get more information from http://en.wikipedia.org/wiki/Spider_cannibalism

I think this is one of the coolest example of nature where male sacrifice for mating or better kind of offspring.