When my Amazons are out of their cages, Coriander (male) always wants the toy that Ginger (female) is playing with. Even when they are inside their cages, they will follow each other's leads on which toy to play with. They like different toys at different times. Sometimes, they are absolutely devoted to this one toy, so when it is eventually destroyed, I buy the same one again for them, but then they hardly touch it. Heheh, they are so funny and spoilt! Coriander has ALWAYS loved to tinkle with his Activity Toy Holee Roller, though. I HAVE to replace this one for him, no matter what! This toy has the most pleasant, gentle, clearly ringing sound out of all the bell toys that I've heard. It's like a windchime. I think it's the outside rubber ball frame surrounding the bell which shields the bell from coming into contact with anything and therefore prevents its sound from being interrupted, while the rubber ball frame itself bounces off things to cause the bell to ring, which gives this toy such a clear sounding tone. (Classically trained musician talking here...)