Update, 9:24PM: Thanks to a fellow Hawk-watcher, I heard that both fledglings were seen hanging out together atop one of the eastern park buildings this evening. The 2nd fledgling wasn’t flying as strong as the other (who’s had a week’s more experience) but it was doing great.
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I saw Sadie on an east-side NYU building flag pole (Education Building) when I approached Washington Square Park today: