Greg picked this up from a rocky riverbank when we were in Quebec last summer, and he gave it me.
It obviously belonged to a plant eater. Greg thinks a moose or bovine (is bovine a noun?).
The tooth is stained with red a bit because I was playing tricks with it on Halloween:
"OH GOD!!" [hand to bloodied mouth]
"ACK!!" [spits blood into palm onto giant tooth hidden there]
"MY TOOTH!!" [displaying giant bloody tooth]