It is not everyday that you see a snake eating a possum in broad daylight.

But that is exactly what greeted passers-by this morning on a walking track in Brisbane suburb The Gap.

One of the witnesses to the display, ABC employee Jane Clark, spotted the snake with its mouth wrapped around the possum and stopped to take a closer look.

"It must have constricted the possum to death before I got there," she said.

"As I arrived I saw it's mouth opening over the possum.

"You could hear the cracks of the possum's body as the snake consumed it."

Snake eats possum as a group of people watch on. ( ABC News: Jane Clark )

People stopped to take photos, though some were too scared to venture any closer to the snake.

"The snake was too busy with his meal. He could barely move," Ms Clark said.

It took almost 18 minutes for the snake to finish its meal, and Ms Clark said the creature struggled the most with the possum's tail.

"The last bit of tail was like a bit of spaghetti that it had to swallow up," she said.