The bell will warn potential prey of the cat's approach. Cats eventually learn to walk without ringing the bell and pet owners are therefore encouraged to regularly change the bell or attach two bells on the collar.
Attaching a bell on a cat's collar will reduce the amount of captured birds by 30–40%.
However, some animal care organizations also claim that the bell annoys the cat, and is ineffective because of cat's hunting behaviour.
- Jasper Copping. "Change your cat's bell to save birds", telegraph.co.uk, 30 May 2010. Retrieved 13 March 2016.
- Anton Karis. "Katter dödar 16 miljoner fåglar om året" (at 8 min), Studio Ett, Sveriges radio, 28 June 2016. Retrieved 28 June 2016. (In Swedish)
- (in German) Halsband mit Glöckchen für Katzen? Nein! www.haus-und-wildtierhilfe.de
- "Animal Wellness Magazine". 8 August 2019. Archived from the original on 2020-06-26.