I brought my tiel outside yesterday to get fresh air and exercise. He has this one branch he really likes, so i put him up there (it's maybe 5 feet up) and he was sitting there. I was playing with him, when I left to use the bathroom. He seemed calm and he was just walking around on his branch when suddenly I came back and he started screaming and trying to fly. He just got his wings clipped so he couldn't really fly, but he seemed really scared and he flew-fell to the ground and started running around and flapping his wings frantically. He still seemed really scared so I brought him back inside to the playset on top of his cage and he calmed down a little bit.
He never had this problem before, and I think maybe it was the other birds chirping outside? They weren't very loud though. What do you think may have caused this?