The sound “wee woo” is often associated with sirens, but it can also be used to describe the call of a bird. The bird that makes a swinging wee woo sound is the eastern whip-poor-will.
The eastern whip-poor-will is a medium-sized bird that is found in eastern North America. It is a nocturnal bird, and its call is most often heard at night. The call is a long, drawn-out “whip-poor-will” sound that is repeated several times.