Yellow rumped warbler breeding behavior

A Yellow rumped warbler was viewed a day ago on the Peninsula carrying nesting material in its beak.  Whether this is a good sign or not ,it might be worthy to check ,look for or listen in to see if indeed a nest is in progress.. Though common species in migration , any warbler except Yellow in the past breeding in Prospect Park is big news.

Here below is the map of the Peninsula where the bird was viewed with the material in its beak.James M.was the observer