Cheetah held at London's Heathrow airport

Image source, PA

A cheetah has been stopped at London's Heathrow Airport.

But he wasn't just sitting on the plane with passengers!

The African cheetah called Isaac was being taken from a South African safari park to Russia.

The authorities have stopped him from travelling further because he doesn't have a microchip.

The chip allows authorities to check the animal's details, like a passport.

They don't know if it's just a mistake, or if there are other reasons why the chip is missing - like smuggling.

Anyone who tries to send an endangered animal to another country without using a microchip is breaking international laws.

Isaac is being kept at a UK wildlife park while investigations continue.