An iguana has three eyes

There is an extra one on top of its head to perceive brightness and movement. 

It’s called the ‘parietal’ eye and helps the iguana to evade predators. 

Research shows the third eye helps these reptiles see days and nights becoming longer or shorter, which tells their brain when the seasons are changing. In turn, this helps them monitor sleep and reproduction cycles.

Many mums have a third eye in the back of their head, at least, that’s what some kids believe to be true …