No bull - a beast that appears to have two faces has been sold at a saleyard in far north Queensland.

Pictures of the bull, which has an extra snout and forehead, have been shared more than a thousand times online after being posted on Facebook by a yard in Mareeba, near Cairns.

A bull with an extra snout and forehead has been sold in far north Queensland. Credit:Mareeba Saleyards/Facebook

Yard chairman Gerry Collins says a genetic variation caused the deformity, which created quite a stir when the bull was sold on Tuesday.

"Sometimes the genetic engineering doesn't quite work according to plan," he said.