Actually, I have seen custom knives with oosic scales at knife shows in the USA. Never knew what they were and I'm sorry now that I do.
Canada is not alone in arcane laws. My grandfather was a judge and amatuer ornithologist. He taught my brother and I a love for birds which continues to this day.
However, let's say you are minding your own business and come across a feather dropped, (whatever the circumstance), from our nation's symbol; the Bald Eagle. You have just broken the law if you attempt to keep the feather as a souvenier.
Penalty? You are banished to live in New Jersey. (I would rather face cheetah's wrath).