Shellbark Hickory (Carya laciniosa).
From Wikipedia:
“Shellbark hickory nuts are used for food by ducks, quail, wild turkeys, squirrels, chipmunks, deer, foxes, raccoons, and white-footed mice. A few plantations of shellbark hickory have been established for nut production, but the nuts are difficult to crack, though the kernel is sweet. The wood is used for furniture, tool handles, sporting goods, veneer, fuelwood, and charcoal.”
Westmount Overlooked 