Dressed in garish shorts and boxing gloves, orangutans trade punches and spin-kick each other in a boxing ring.
Horrifying footage shows cheering tourists drawn to the barbaric sport at a theme park called Safari World on the outskirts of Bangkok in Thailand.
The same company was banned from doing exactly the same thing just six years ago.
While an orangutan pretends to be knocked out of the boxing ring, others, dressed in bikinis are trained as round card girls and bell ringers.
The apes kickbox each other as a spectacle for tourists in a show lasting more than 30 minutes, before being returned to their dark cages. It is not known how many orangutans have been captured and trained by Safari World.