Megaladapidae is one of the families of primates that is often argued over by taxonomists. Everyone has an opinion in taxonomy. I have decided to put it as a separate family because honestly, sportive lemurs are pretty cool. Megaladapids were said to be extinct because the taxonomic group originally covered all of the giant lemurs the size of gorillas that use to roam Madagascar. But like most megafauna, it was killed off by humans.