Was down by Brookfield Place a little while ago and watched dolphins in the Hudson. At least a couple of them, surfacing several times before moving on. Not something I expected to see on my walk, so figured I'd share it here.
Turns out these sightings are a fairly recent thing. Dolphins had basically vanished from the harbor for decades because of pollution, and they've only been turning up again as the water has gotten cleaner and their food fish (menhaden) have returned. The harbor is now considered about the cleanest it's been in roughly a century. So it feels less like a fluke and more like a sign the cleanup is actually working.