Why do geckos poke their tongue up their faces?

Geckos poke their tongues out to gather chemical information from their surroundings, a behavior known as tongue-flicking. By doing this, they can sample scents and pheromones in the air, which helps them navigate their environment, find food, and communicate with other geckos. Their tongues are equipped with specialized receptors that allow them to detect these chemical cues effectively.