Alien eyes of amphibians

Those unnerving, almost alien eyes of reptiles seem to pierce your soul. These eyes hold history - you can see how different species have evolved over millions of years. Professional wildlife photographer Daniel Heuclin travels the world and takes pictures of various tropical frogs and lizards that stare right into his lens.

Daniel was amazed by the diversity of species he encountered. This is his favorite photo.

Pictured: The eye of a red Madagascar frog.

Pictured: The thoughtful look of a Cuban tree frog.

The vertical slit in the eyes of this Philippine gecko resembles the eyes of a cat.

This tree frog appears to be patiently posing for the photographer.

The "all-seeing eye" of the red-eyed tree frog.

Tokay gecko eye. Philippines.

The contracted pupil of this Cape Verde gecko looks like it belongs to an alien creature.