What are monarch caterpillar’s tentacles and antennae for?

The caterpillar’s tentacles are sensory organs. Caterpillar’s eyesight is poor, and tentacles are tactile. They aid in navigation on the front. They may also play a role in defense/predator confusion on the rear, leading a potential predator to think that the monarch’s rear is its head. Caterpillar antennae (located near their mandibles) aid in smelling and are used to find food.