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The round pupil in a lizard is generally better adapted for diurnal species whereas slit pupils are found in nocturnal species.  Most lizards can see in color and some have opsin proteins which allow them to see in ultraviolet wavelengths that the human eye cannot perceive.

The round pupil in a lizard is generally better adapted for diurnal species whereas slit pupils are found in nocturnal species. Most lizards can see in color and some have opsin proteins which allow them to see in ultraviolet wavelengths that the human eye cannot perceive.

I've always loved this picture! What a beautiful, old creature. His missing fore limb shows the harshness of the conditions in which he lives.. Beautiful.

I've always loved this picture! What a beautiful, old creature. His missing fore limb shows the harshness of the conditions in which he lives.. Beautiful.

21 Dogs Who Don't Realize How Big They Are. If this doesn't make you smile, I don't know what your problem is! :)

21 Dogs Who Don't Realize How Big They Are

21 Dogs Who Don't Realize How Big They Are. If this doesn't make you smile, I don't know what your problem is! :)

My God, his head is ENORMOUS. That's why he's intimidating...your whole entire self would fit in there!!

My God, his head is ENORMOUS. That's why he's intimidating...your whole entire self would fit in there!!

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