The diverse way in which nonhuman animals (animals) live is fascinating and we're constantly learning more and more about interesting patterns of behavior. One such recent discovery centers on the mating habits of marsupial mice, who aren't really mice at all. Rather, they are members of the marsupial Family Dasyuridae who are native to Australia and New Guinea.
A recent study by Diana Fisher of the University of Queensland summarized here reports on "suicidal sex" (known as semelparity) by male marsupial mice. The abstract for the original research paper published in the Proceedings of the National Academy of Sciences can be seen here.
The story about these small mammals is very interesting. It turns out that females are highly promiscuous and this generates intense competition among makes. Breeding occurs when the food supply, insects, is at its highest. And, because breeding only happens once a year, it pays off for males to put everything into sperm production and hope for the best.