Far North Queensland resident Kerry Roberts could hardly believe her eyes as she watched a cannibalistic green-striped frog take on a green tree frog its own size and win, the Townsville Bulletin reports.

Ms Roberts' attention was drawn after she heard frantic squeals from the distressed frog as it became a meal on Wednesday morning.

"I heard a splash in the pool and I thought 'oh my God, there's a snake in the pool eating a frog'," she said.

"I went out to have a look and found a frog in our pool and then I looked in its mouth and it had a big frog in there.

"I don't know how it managed to swallow it because it was practically as big as him."

Ms Roberts, who lives in Bushland Beach north of Townsville, said the frog had been hanging around her yard for several weeks.

credited to news.com.au