All collars come with a warning bell to help protect wildlife the rspb estimate that uk domestic cats are responsible for over 275 million kills each year 55 million of these are birds did you realise that a cat wearing a collar with a bell will catch 41 fewer birds and 34 fewer mammals source www rspb org uk when fitting this collar please ensure that you can get 2 fingers between your cat and the collar for safety and comfort warning if using liquid flea treatments please remove