After many years of debate, the AOS (American Ornithological Society) in 2017 moved the yellow-breasted chat (Icteria virens) to the Icteriidae. It is the only member of this family.
As you may know, this seven-inch songbird was once a member of the New World warbler family (Parulidae)
The reorganization does not end the controversy among researchers. Several still believe blood analysis suggests the chat should remain in the Parulidae.