Since it came from Harrier Meadow in the Meadowlands, I'll go with muskrat for now. Too bad it had no teeth or lower jaw.
I will bring the skull to the birding festival on Saturday and see if I can get naturalist Don Smith's verdict. (Don has trapped thousands of muskrats over the years.)
I'll also bring an empty DDT can, a chunk of Chert, a chunk of copper ore, a replica Bald Eagle egg and a "Krajewski for President" campaign button.
What do they all have in common?
(I love show-and-tell, don't you?)