I have a female Conure, seven years old. She has gone to the same bird store to have her nails trimmed since she was born. A year and a half ago, when she heard the loud noise of the birds in the store, before she got inside, she flapped frantically, her eyes shut, and her body went totally limp except she hung onto the side of the cage with her beak. Her legs dangled, wings splayed, eyes stayed shut. I went back to my car and held her in both hands. It took more than 60-seconds before she opened her eyes, and about five minutes before she stopped looking like she was in an egg-laying trance.
I thought it was a freak occurrence. Three months later I played the sounds of a flock of birds on my computer and she started the same behavior. I shut it off immediately.
Today I took her to the bird store again, but I approached the store carefully. As soon as someone came out the door and the decibel level of the birds increased dramatically, she repeated the behavior exactly.
Needless to say I won't let her hear any flocks of birds again, but I'm curious to know whether anyone else has encountered this behavior.