Takes a little bit of getting used to, once you've mastered the initial blowing bit it takes a while to start getting different bird sounds. Good fun trying and very annoying to other which in itself is fun.
I bought two of these individual ones and the party pack of 6 of them (same supplier) to give to some friends' children thinking that the individual ones would probably be better than the party pack ones as they cost so much more each. They arrived and were all the same size: 6cm - tiny, plastic and complete rubbish and look like they came out of a cracker. I remember having one as a child and it was great. These are not worth buying at all.