Two saltwater crocodiles have been photographed in a duel to the death in a remote Queensland waterhole.

The pictures, taken in the Rinyirru (Lakefield) National Park in North Queensland, show a big saltie grabbing a smaller reptile in its jaws and shaking it in the air.

The final photo shows the smaller croc disappearing down the larger reptile's gullet.

The photos were taken at the park's Catfish Waterhole.

Queensland National Parks said the incident occurred a few hundred metres from a sign warning about crocodiles, and have urged people to continue to keep safety in mind when in croc country.