Need some help with this one. It was very tiny and I could recognize the sound if I heard it. Was one long very high pitched Trrrillllllll.
Singing right in front of me!
Jefferson Parish, Louisiana, US
The Blue-winged Warbler, Vermivora cyanoptera, is a fairly common New World warbler, 11.5 cm long and weighing 8.5 g. It breeds in eastern North America in southern Ontario and the eastern USA. Its range is extending northwards, where it is replacing the very closely related Golden-winged Warbler, Vermivora chrysoptera. It was formerly called Vermivora pinus, but this name is invalid, as it was given after descriptions of this species and the Pine Warbler.