After more than 30 years on the job, one of Singapore's best-known campaign mascots has apparently tendered his resignation.

In an open letter to Singapore posted on the Singapore Kindness Movement (SKM) website on Wednesday, Singa the Lion wrote: "I quit. I need a long break, and you could probably use a break from me too. No one likes being nagged at, even if it's about being kind and gracious."

"I suppose it's time for real people to step up and for the mascot to step aside."

The letter came just days after the SKM announced that Singa was venturing into cyberspace.

Singa made his debut in 1982, and has fronted several public education campaigns since. He was adopted as the official mascot of the kindness movement in 2009.

A spokesman for the SKM told The Straits Times that no new mascot is being considered at the moment.