How do active-foraging lizards use chemical senses differently from sit-and-wait lizards?

In the context of feeding behaviour, lizards exhibit distinct strategies that correlate with their use of chemical senses:

• Active-foraging lizards: These lizards (such as skinks and whiptails) actively search for prey by probing and digging through their environment. Because they use their jaws to capture prey (jaw prehension), their tongues are free to function as specialized organs for chemoreception. They rely heavily on a well-developed vomeronasal organ (or Jacobson’s organ) to discriminate among prey types, allowing them to select energy-rich food and avoid noxious chemicals. This system also enables them to locate hidden prey, such as insect larvae in soil, that would be invisible to visual predators.1234

• Sit-and-wait lizards: These lizards (such as iguanas and chameleons) typically remain motionless at fixed sites, relying primarily on acute vision to detect movement. Because they use their tongues for prey capture (lingual prehension), they generally lack the ability to use the tongue as a primary carrier of chemical signals to the vomeronasal system. Consequently, they depend on visual cues rather than chemical discrimination to find and capture food.12