Twinkle and Cosmos do it to get attention, usually when they have just been lured back into the cage for bed time. Twinkle especially sits at the cage entrance occasionally pinging the cage bars to get our attention when the staring doesnt work. Saturday night stayed up late watching the remembrance service on bbc1. This meant supper was late, we got the stare, the bar ping, then we suddenly got a deep disgruntled wheek followed by a long stare. Supper was duly given and peace resumed.