One of the gigantic Chelydra serpentina of Brooklyn.
Another? There were at least two big ones in this pond. But note the difference in leech positions.
By the way, just look at all the parasitic life-forms latched onto this one’s head and neck! Crowd-sourcing these pictures to Twitter, I found some suggestions that these were Placobdella parasitica and P. ornata, a.k.a. the turtle leech.
Backyard and Beyond 
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