Schoolteacher Michael Maguire spotted what is believed to be a 3m bull shark in Norman Creek in Brisbane, Australia, according to a Courier Mail report. Maguire estimated the bull shark at 3-4m in length. However, according to the Ten News report above “marine experts” doubt the estimation in the shark’s size.

While Maguire said that bull sharks were common in the Brisbane River, he was quite surprised at the sight of the shark in Norman Creek. While Maguire expressed concern over children playing in and around the creek, he said he would return to kayaking in the water within a few days.

Trevor Long of SeaWorld points out that sharks are not out there looking for humans, rather bull sharks and other marine species often travel upstream to give birth.