"The beaver's emblematic status originated from the fact much of Canada's early economic history was tied to the fur trade in beaver fur, used to make hats fashionable in Europe. Another reason for the beaver's status in Canadian heraldry is that it is symbolic of industry, due to its habit of constructing dams and lodges. Beavers appear on the reverse of Canadian nickels (5 cent piece)."
Also the horse (I didn't know that it was official and I'm Canadian!)
"The Canadian Horse is an official Canadian symbol and commonly appears in images with the Mounties. The officer cadets of the Royal Military College of Canada are normally represented in their distinctive scarlet uniform with a ceremonial sword or swagger stick."
See http://en.wikipedia.org/wiki/National_symbols... .