Look closely at the green turtle’s beak and you may see the serrated edges used to slice the seagrass blades which make up most of its diet. Green turtles are one of the largest hardback turtles, their carapace measuring up to 1.5 metres long. Turtles use a number of cues, including the position of the sun and the earth’s magnetic field, to navigate to and from their foraging and nesting grounds. (Photo by Philip Hamilton/The Guardian)
