 Most forms of camouflage are ineffective when the camouflaged animal or object moves , because the motion is easily seen by the observing predator , prey or enemy . However , insects such as hoverflies and dragonflies use motion camouflage : the hoverflies to approach possible mates , and the dragonflies to approach rivals when defending territories . Motion camouflage is achieved by moving so as to stay on a straight line between the target and a fixed point in the landscape ; the pursuer thus appears not to move , but only to loom larger in the target 's field of vision . The same technique can be used for military purposes , for example by missiles to minimise their risk of detection by the enemy . However , missile engineers , and animals such as bats , use the technique primarily for its efficiency rather than camouflage . 
