A couple of fellow Hawk-watchers and I call the time in late morning/early afternoon “The Witching Hour” as it’s the time the Hawks routinely leave the park grounds (especially in summer) for other adventures.
I wasn’t able to get to the park until the dreaded Witching Hour today and sure enough I did not see the Hawks in or around the park. I arrived at the park on the cusp so I took the risk and lost the gamble.
Discarded NYU butterfly display case on Greene Street: