I keep my feeders high off the ground, but was extremely upset a few weeks ago to see a cat take a bird out of my bird bath where it was gaily splashing away. Before I could get out of the house, it was gone with it’s prey. I know that this is what cats do; one of mine was a skilled predator, collar notwithstanding. I did put collars on my cats for no better reason than to house a contact details capsule, and this proved to be an excellent strategy when my sister took over one of our cats as we were going abroad, and cat decided she wanted to go back to where we had lived (Yorkshire to Essex? Nah! Not many cat miles it seemed! I think she had been reading too much Dick Whittington!). She was found, emaciated, nearly five miles from home (strangely, going in the right direction!), in a churchyard and returned to my sister to live out a happy and thereafter uneventful life!