There are several signs posted along East Fifth Street between Cooper Square and Second Avenue... (You can click on the post for a better view...) ... about a nest of baby Blue Jays... they are in danger of falling, but that's OK. The instructions on the sign tell you what to do in the event you find a dazed Blue Jay on the street...
And there's more information about what's happening here via AnimalTourism.com:
"The eggs have hatched in the fire escape nest built by blue jays on Fifth Street ... but that hasn't stopped the blue jay father from obsessing over the cat who lives down the block."
And there's video!