“This week’s entry, the topi antelope, comes courtesy of the BBC. Like other similar species, there tends to be a high female to male ratio among the topi. When it comes to mating that’s great for the males right? Well in this case it might be too much of a good thing.It turns out that the females are fertile only one day a year. All of them… on the same day.
This is evolution at it’s finest, because such a scenario has produced some very sexually aggressive female antelope.”

 “It is not uncommon to see males collapsing with exhaustion as the demands of the females get too much for them ”