A bizarre video has emerged from the Amazonian rainforest showing what appears to be a small "alien creature" standing next to a flash of light.

The video is believed to have been taken by two British tourists during a trip to the Mamaus region of the Amazon rainforest before being passed on to the Brazilian government, the Sun has reported.

The footage shows the creature standing just a few metres from the orb of light. Paranormal writer Michael Cohen says the footage may be among the best proof that aliens exist.

"This is highly compelling footage that will be hard to discredit," he said.

"It comes from an area known for experiencing intense UFO activity. It is rather apparent that aliens are interested in this region due to its biological diversity".

While the camera is focused on some young children, a silvery light is seen in the distance behind them.

However, it is only when the one looks closely at the surrounding jungle does the "small being".