I have been acclimating a silkie to an outdoor wire cage. This morning I let her wander around the yard., She got a few earthworms, some sunflower seeds and then I put her in the cage with a grape and 3 slices of zucchinni. A bit later, I looked out the window and saw her jump like she had been bitten by something. i went out and her eyes were half closed and she ws sitting. I picked her up; her beak was open, breathing normally. She did not make much of a fuss and I brought her to her inside cage. She has been relatively still, moving a bit and her beak remains open. Does anyone have any idea what could have happend to her? A friend with chickens suggested crop impaction. DOes that happen suddenely? She was eating plants in the yard. Could it be a toxin? Thanks for your comments.