But in one Derbyshire village - it's for a slightly different reason.
Residents in Kirk Hallam are visited regularly by hungry swans - who actually "knock" on doors and windows with their beaks demanding food! Locals know to have some bread handy for their neighbours' visits.
Locals say they've been feeding the swans for years and didn't realise how unusual their trusting behaviour was until recently. They look forward to their visits and although the swans do scare off postal workers, they say they wouldn't be without them!
Carley Holmes, 40, who works for Derbyshire Council says she has been feeding the swans for years. She says,
The swans always raise a smile and are a special part of living in Kirk Hallam. I didn't realise how unusual their trusting behaviour was until recently. We look forward to their visits, especially when they have their new arrivals in tow in the Spring.
The grown ups are also teaching their young the same tricks, so it looks like this tradition will be lasting for a good while longer in Kirk Hallam.