A leaf warbler fly-by

The leaf warblers form the only genus belonging to the family Phylloscopidae, introduced in 2006, prior to which it was placed in the Old World warbler family Sylviidae that has undergone much revision of the past couple of decades. The Phylloscopidae contains 81 species of tree-loving warblers that occur primarily in Eurasia and Africa, with one species making it as far east as Alaska.