Theo Bosboom / Close-up of Emerald damselfly (Lestes sponsa) compound eye, covered in dewdrops, Hatertse vennen, the Netherlands, July.

Paul Bertner / Fly with compound eyes, Khao Yai National Park, Thailand

Alex Hyde / Close-up of Owl Butterfly (Caligo memnon) head showing compound eyes and proboscis. Captive, originating from Central America.

Andy Sands / Robberfly (Machimus cingulatus) head close up showing large compound eyes. Captive, UK, July.

Lisa Hoffner / A baby orphan Elephant (Loxodonta africana), named Murka, wounded by a poacher's spear is comforted by the touch of another elephant's trunk from outside its pen. David Sheldrick Wildlife Trust Eleph...

David Maitland / Close-up view of the upward-looking giant dorsal compound eyes of the St Marks fly (Bibio marci) used to detect female flies flying above. Like many insects the eyes are "hairy". Feltwell, Norfolk, UK...

David Maitland / Close-up view of the upward-looking giant dorsal compound eyes of the St Marks fly (Bibio marci) used to detect female flies flying above. Like many insects the eyes are "hairy". Feltwell, Norfolk, UK...

David Maitland / Head of female St. Marks fly (Bibio marci) showing normal sized compound eyes. Feltwell, Norfolk, UK

Russell Cooper / Common Darter Dragonfly (Sympetrum striolatum) head and compound eyes, South London, UK, September

Alex Hyde / Close-up of compound eyes of unidentified fly {Diptera}. Masoala Peninsula National Park, north east Madagascar.

Stephen Dalton / Head of Horsefly (Tabanus sp) showing compound eyes, UK

Paul Bertner / Ground Beetle (Carabidae), Ankarana Special Reserve, Madagascar