Parakeet birds at the County Fair

Today I was watching the parakeet birds at the small animals exhibit at the Alameda County Fair. I was enjoying watching one bird obsess over the colored rings with a bell at the end. Last time I visited this display two birds were fighting over a ladder. Only one bird was playing with the ladder today. There must have been over 100 birds in the cage. A little girl wearing a straw hat and sunglasses walked up to the cage wall and all of the birds immediately stopped moving and went silent. It was as if they were playing freeze tag. They stayed this way for a couple of minutes and did not resume their activity until she walked away. Fascinating!