Chameleon Eyes Are Independent - Until Dinner Appears
A chameleon appears to run two separate security cameras at once. One eye scans one part of the world while the other checks somewhere else.
The truth is even more interesting than the popular myth. Chameleon eye movements can be disconjugate - pointing in different directions - but research shows they are not simply two unrelated systems. The eyes coordinate their tracking, and when the chameleon selects a target, both converge for a binocular view.
That moment matters. Two eyes on one insect provide the precise spatial information needed before the chameleon fires its tongue. Scanning mode becomes targeting mode.
Humans do nearly the reverse. Our forward-facing eyes usually move together and share a large overlapping field. That costs us panoramic coverage but gives us strong depth perception in front of the face.
The chameleon gets a wider watch and a carefully timed lock-on. It does not have two minds. It has one visual system that knows when to divide attention and when to bring everything together.
First the eyes explore separately. Then dinner brings them into agreement.