We can't believe it. There apparently was a manatee swimming up the Hudson since Saturday, and we had no idea. Observers spotted him at 23rd Street, then at 125th Street. We suppose he continued north, though it would have been cool if he turned around to venture over the Boat Basin and give us a shout. Gothamist will have to head to the New York Aquarium for our manatee fix, instead.

Last year, a baby seal was lost in Brooklyn. Sometimes harp seals like to hang out on city docks to molt. And at the beginning of the year, a whale was swimming in the Thames.

Photograph by Bluejake