Female elephants thwart a male attempting to mate with a small female. Photo: Michael Nichols, Nat Geo Image Collection

Males of many species slow down in their pursuit of females as they age. Not so with elephants. Studies reveal that bull elephants increase the energy they put into reproduction as they get older.

In fact, elderly males invest much more effort in tracking down and mating with females than do younger male elephants, according to a new study.