Iduna is a genus of tree warbler in the family Acrocephalidae. Keyserling and Blasius gave no explanation of the genus name Iduna. It is sometimes lumped in the genus Hippolais, although in 2009 it wa

The eastern olivaceous warbler, known simply as the olivaceous warbler when its western relative is referred to as the 'isabelline warbler', is a small passerine bird with drab plumage tones, that is