Hi guys great show as always & i love bbc sound effects records. I own quite a few myself and used to use interesting sounds as ringtones. After hearing monkey sounds many many times i noticed that the sounds were not monkeys but people making monkey sounds. If you listen closely to the chicken sounds i believe that it is not a chicken but a person. As usual I have done no research however many of the animal sounds in my personal collection are definitely made by people.
Listen carefully, not a chicken.