What has caused HistoryOwl to evolve?

In pre-digital times, there were only two species of owl. The first were the sort that sat in trees and said "too-wit too-woo". Well, strictly speaking (according to the Wildlife Trust), a male said twit and the female (he hoped) responded with twoo. There were many sub-species of these for which you'd need to visit the Natural History Museum to find out more.