Ashwin answered the first part of the question:The largest donkey has the longest noise and the smallest donkey has the shortest noise.
Thomas and William from Great Dunlow Primary looked at the second part of the problem. To hear two owl "twittwoos" and four donkey "eeyores":
Mikey from Mason Middle School then says:
Well done, Mikey - you would have to put an owl and a donkey on the wheel with a space then turn it several times. Thank you all for your solutions.