Golden-crowned Kinglet (Regulus satrapa)
Zeee call: High and thin with a slight buzz. Very similar to the common call of the Brown Creeper, but the Kinglet usually gives a series of 3 or 4 notes at a time, while the Creeper's call is usually given singly.
Golden-crowned Kinglet zeee calls, October 30, 2010. Doctor's Park, Milwaukee County, Wisconsin.