At first glimpse these pictures may look like nothing out of the ordinary - appearing to just show an ordinary leaf or a branch of a tree. But on closer inspection you can spot some of nature's true masters of disguise playing a killer game of hide and seek. From a katydid disguised as a leaf to a tiny Pygmy Seahorse camouflaged in sea fan in Papua New Guinea, these images showcase the creatures who can quite literally blend into the background. Illusionist: A leaf-mimic katydid - also known as a bush-cricket - camouflaged to look like a dead leaf to hide itself from predators. Keeping a keen eye: John Cancalosi, who took this snap of a tiny red crab camouflaged on a Sea Fan in Papua New Guinea, said even he sometimes struggles to spot the creatures he photographs.