Ammonite / Close-up of a Yellow slug (Limax flavus) moving towards the camera leaving a slime trail and extending and retracting its eyestalk, footage taken using an endoscopic camera, Bristol, England, UK, Marc...

Paul Bertner / Stalk-eyed Fly (Diopsidae) female compound eyes, Mount Isarog National Park, Philippines

Ingo Arndt / Carpathian blue slug (Bielzia coerulans) Slovakia

Ingo Arndt / Carpathian blue slug (Bielzia coerulans) detail of eye on antenna / Slovakia

Bernard Castelein / Robberfly (Asilidae) on plants stalk, Peerdsbos, Brasschaat, Belgium

Juergen Freund / Close up of eye of Christmas Island red crab{Gecarcoidea natalis} showing tiny hairs that clean the eye stalk, Christmas Is, Indian Ocean

Juergen Freund / Close up of eye of Christmas Island red crab(Gecarcoidea natalis) showing tiny hairs that clean the eye stalk, Christmas Island, Indian Ocean

Birgitte Wilms / True Conch (Strombus sp) feeding, Papua New Guinea

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) has its eyes at the tips of long stalks much like Hammerhead Sharks, Brunei, Borneo

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) has its eyes positioned at the end of long stalks much like Hammerhead Sharks, Brunei, Borneo

Emanuele Biggi / Stalk-eyed fly (Diopsidae) male, portrait, Kibale National Park, Uganda.

Emanuele Biggi / Stalk-eyed fly (Diopsidae) male, cleaning its incredibly long eye-stalks using its front legs, Kibale National Park, Uganda.