Active and agile feeder in tree foliage at low to mid-levels.
Short, musical weety-weety-wee or weety-weety-weety-wee; last note is occasionally higher.
Full tship or dzip, also a harsh tshekk; a buzzy zee in flight.
In native N America: young conifer stands; on migration, found in other woodland, thickets and tall scrub.