that seem to be on every bird toy you buy
![Image](http://www.hudson4supplies.com/images/produits/15a_374_nkl_key_ring_leather_accessories_hardware_porte_cle_cuir_accessoires_quincaillerie.jpg)
My bird has discovered the joy of unscrewing them and removing his toys from their places.
So I linked two of them together for him to sit around and play with. He'll eventually unscrew one.. take it apart, then drop them both and whine at me to put them back together.
Thought it was neat, figured I'd share.