Here are a few photos. Canada got rid of the one and two dollar bills awhile ago. It started with the one dollar paper bill...replaced by a coin with the queen on the front and a loon on the back, so we started to call it a loonie. Then a few years later the two dollar bill was replaced by a coin and people just started to call it a toonie, and it stuck.
Currently our paper bills are being replaced by polymer ones. I just receivec my first polymer $20 this week, and it has a see through area....as you will be able to see on my one photo. It would certainly be hard to counterfeit them, that's for sure.