Living in the deep sea, these ostracods (a kind of crustacean) never see sunlight. They have the best night vision of any known animal and probably use their eyes to search for bioluminescent animals ...

The animal kingdom is full of mesmerising creatures ... Elephants have large, kind eyes that are like a symbol of their gentle and intelligent nature. The deep brown or amber eyes of an elephant ...

Eyes of this kind are still found in cubozoans ... Trilobites weren’t the only animals to stumble across this invention, although they were the first. Biologists believe that eyes evolved ...