The Weibo Bird is only for Angry Birds Weibo and Angry Birds Websites...Whats that, Weibo Bird? You want to go into other games? Ok...you can put him in your games!
He started as an original Weibo, making him unintresting, but growing a beak and eyebrows turned him into a Bird!
A few years later, he had a brother, but it was actually a weibo logo with eyes and a beak.