whistle

So this just started yesterday and it's been happening ever since. When I leave the room, my cockatiel will give out a flock call as usual and I'll whistle back a certain tune and he's satisfied. But yesterday when I whistled back he screamed twice and then stopped. It's happened each time I've...

do all males wolf whistle as there natural call?

hello is a wolf whistle , the natural call of a cockatiel ?

I had to share my little girl. to be honest am not sure if she is a she or not but ya know what she is to me. take a gander. There is two video's of Pebble so far Pebbles bath and Pebbles voice hope you enjoy.. I did:D http://www.youtube.com/user/cloudykittyy?feature=mhee

Our cockatiel is currently pacing about on perches and on the floor, looking at the floor, doing her little "Hello!" whistle. She's mainly looking at the corners, I think. Could this possibly be nesting behaviour? Or just an interesting part of the newspaper she's trying to communicate with? :)...