Canadian goblins. They are mostly found in the mysterious dark forests of Cananda and tend to piss people off by popping out of the ground randomly and tripping people. And they are in fact overpopulating Cananda but are unable to cross its boundries and move into the US due to magical pressure involving the Tronks.
Dude, I went to Canada and it was like: Aughhh! FUCK! I hate these freaking woblins! THEY KEEP POPPING OUT OF NO WHERE! SHIT!!!!!!