Do Xenomorphs Have a Tongue?

The inner jaw, also known as the inner mouth, is one of the most iconic physical features of the species Xenomorph XX121. It consists of a piston-like tongue tipped with a secondary set of jaws located inside the creature's mouth.

Why do Xenomorphs have 2 mouths?

In the Biology Section it points out that the "tongue mouth" or secondary jaws (or mouth) is what the Xenomorph eats with. (So my original guess that the secondary one would hold the food is wrong - the large mouth holds it if needed.) Even more, the Secondary Jaws can be used as a close-combat weapon.

What senses do Xenomorphs have?

The xenomorph has a set of powerful infrared eyes, among a strong olfactory sense and possibly echolocation, they most likely use the infrared eyes to identify and observe objects, prey, enemies, and other xenomorphs.