parakeet stroke

Female Parakeet (Budgerigar) acting funny, or what?

I have a female parakeet 6 years old. Yesterday came out of the cage to perch on my shoulder (as usual) but did it 'pose', head and tail up, and froze like that for a minute. Could pet in the back and head, who usually hates. Is it a kind of bird mating thing? Or was he having a stroke? She is a very friendly bird, a real hug mistake. "He also just start doing the vomiting / Feed Me else. She has done it again today. When she awakes, she is back to his car still weak. I just want to make sure it is not ill. Thank you all for the answers! I took Petey (my bird) vet. Apparently she is looking for mate, "and is normal behavior. Now I have to wait and see if they will lay eggs (unfertilized) sometimes happens.

I do not think she is my bird is sick all the time, but if you wish you could get your checked above.

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