Personally, I'd like to see pet collectors have a chance at pets from other countries. How many cool pets did Korea or China get, that US players never had a shot at obtaining?
You can still get them, I randomly remember to check for that daily, two days ago, it was there, I did it on 3 toons, and was rewarded with Chuck's Bucket.
Yes, you can cage these pets. The raven and jade crane can be traded. I had a guildy grab one of each for me. And you dont have to buy cages. Right click the pet, choose the put in cage option. Easy as can be. Happy Hunting!