All right, what we'll do is this: I'll stand here and ask different parrots to come forward. When they come into the light, we'll all count them together. Then, when they've been counted, they can stand behind me so we don't count them again. Does everyone agree?

Everyone agreed, so he began.

All right, how many kinds of black cockatoo are there?

And someone right at the back called out Twenty-eight!