Scops owl
In the early 20th century, scientists liked the idea of putting species in a few big groups instead of more small groups. The 3rd edition of the AOU checklist in 1910 put the screech owls back in Otus. Although not all scientists agreed about this, it was the most common way to think about owl groups for most of the 20th century. In 1988, some scientists tried to put back all the genera from 140 years earlier by treating them as subgenuses inside Otus. But this did not make sense.  It did not match the evolutionary and phylogenetic information.