caitlin rankin, from the sea turtle conservancy, has been helping to protect these creatures since sheu can help me with it? it's the calliper. what's this for? it's for taking measurements of the carapace — from the turtle. wow. yeah. are they that big?! they can be. yeah. wow! until one metre and...a half sometimes. 0h. i hope we see some that big tonight. yeah. that'd be amazing. when we get to the beach, we'll have to turn off our lights as they can scare the turtles. but if we're lucky enough to find one, we can switch to our sensitive red lights. when you get there, how do you find the turtles in the dark? oh, we look for tracks first, and the tracks looks darker than the sand. we follow the tracks and we find the turtle. oh, can't wait. let's get going. look at this. yeah. it's beautiful, right? my eyes are already adjusting... i can actually see your face. i can see everything around me. but i can't see any tracks yet. can you show me? there's one. what? so this is... ..down track. so these turtle already left. but it's an up track. so we have a turtle up there. aha! one is her