Dr Laura Ryan,a neurobiologist from Macquarie University who has studied how juvenile white sharks can confuse surfers for seals,said the tigers found it hard to detect turtles when they remained motionless and blended into the background.
This is because the shark could not see as well as a video camera or human,according to Ryan,meaning it had to rely on other forms of movement to find the turtles.
But turtles at Ningaloo – which include the green,hawksbill and loggerhead species – have better vision than a tiger shark and are more likely to detect it approaching from a greater distance.