Reptiles often use their tongues to find prey, flicking them in and out to pick up scent particles in the air. These particles are then carried back on to the tongue to a special nerve centre in the roof of the reptile’s mouth, called the Jacobson’s organ, which analyses the scent. Snakes usually have long, black, forked tongues while lizards have short, blunt, greyish tongues with a notch in the tip.