A Zoo in China turns into a gruesome horror show in a sick new video that has surfaced online.
Charity campaigners have rushed to condemn the clip, which shows a bear mauling a monkey after being forced into a grim bike race by zookeepers.
The sickening stunt — conducted by Shanghai Wild Animal Park in China — sees the large black beast made to ride a circuit against two tiny primates.
But the twisted competition ends in horror when the bikes collide and the bear goes berserk, clamping its jaws around one of the monkeys.
Few other details are known about the clip, but the monkey is not thought to have survived.
Will Travers, CEO of the Born Free Foundation, said: "Horrific and depraved – words cannot describe this brutal foolishness.
"The circus should be closed. The animals should go to Sanctuaries. The operators should be arrested for cruelty and neglect.
"We say enough is enough - and I know many Chinese who would be equally horrified."
A spokensman for another animal charity, PETA, also responded to the video, saying: "Time and time again, we've seen that holding wild animals captive and forcing them to perform silly tricks can lead to neurotic behaviour and depression.
"The basic instincts of a natural predator never go away – many attack other captive animals as well as humans.
"To detain a bear – who would ordinarily establish a territory of many miles – in a restricted, unnatural environment can only aggravate and frustrate him or her and eventually drive the animal insane.
"These highly social, intelligent animals suffer from debilitating loneliness and depression when isolated from their families.
"Many retaliate by attacking their captors and attempting to escape at any given chance.
"These and other animal acts are archaic and have no place in any civilised society."
In the spectator video, which we have censored here, crowds at the park can be heard laughing as the captive beasts ride in circles around the arena.
But the giggles quickly turn into screams as the bear loses control and pounces on the tiny monkey, which remains motionless after park officials are eventually able to pull them apart.
Nobody from the Shanghai Wild Animal Park was available for comment.