Pink is a vocal animal rights campaigner

Gildah has been part of the duo's act for 13 years but has been kept alone in a Las Vegas pen since Roy Horn was mauled by a tiger in October.

"Peace on Earth seems out of reach for much of the world this year, but won't you please grant it to one pathetic, old, lonely elephant?" Pink wrote.

The singer asked them to donate Gildah to an elephant sanctuary.

"In a sanctuary, Gildah could forage through hundreds of acres of lush vegetation, play in the pond and at least have some life as nature intended. Sure beats life in a tiny tourist trap," she said in the open letter.

Pink wrote that she had seen a first hand "how out of place elephants are around bright lights and gawking people" after making the "mistake" of using one in the video for Just Like a Pill.

Siegfried and Roy's magic show in Las Vegas was legendary

Pink is a vocal member of the People For The Ethical Treatment Of Animals, lending her support to its animal welfare campaigns.

She recently wrote a letter to Prince William following reports he had speared an antelope during a trip to Kenya, saying she was disgusted at the news.

His spokesman denied the prince had hunted a small deer during his holiday, and would personally write to the pop star to assure her of this.

Magician Roy Horn, who as one half of Siegfried and Roy was one of the most popular acts in Las Vegas, is still recovering from horrific injuries inflicted by a tiger during a show.