Stephen Dalton / Two Water Fleas (Daphnia sp.), showing transparency of bodies and internal organs. UK, September.

Alex Hyde / Green Huntsman Spider {Sparassidae} on leaf in tropical rainforest, Masoala Peninsula National Park, north east Madagascar.

Stephen Dalton / Emperor dragonfly (Anax imperator) in flight, male, UK

Stephen Dalton / Broad bodied chaser dragonfly (Libellula depressa) recently emerged from larval case, UK

Sue Daly / Lightbulb seasquirts / tunicates (Clavelina lepadiformis) cluster on rock, Channel Isles, UK, July

Sven Zacek / Misty morning with dragonfly silhouetted in dawn light, on lake, Estonia

David Shale / Deepsea squid from midwater catch 195-498m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Greater silver hatchet fish (Argyropelecus gigas) Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Eryonicus larva of Shrimp {Polycheles sp) from between 2710-2798m, Mid-Atlantic Ridge, North Atlantic Ocean

Jack Dykinga / Glass frog (Centrolenidae) clear egg case with tadpoles encased above Costa Rican tropical rainforest stream in the Osa Peninsula. Costa Rica

Stephen Dalton / Water Flea (Daphnia sp.), showing transparency of body and internal organs. UK, September.

Robert Thompson / Common hawker dragonfly (Aeshna juncea) on heather flowers, Upper Lake Glendalough, County Wicklow, Republic of Ireland, August

Michael & Patricia Fogden / Glasswing (Greta sp) of the family Ithomiinae, on fern frond showing transparency, cloud forest, Costa Rica

LYNN M. STONE / Golden retriever puppy in snow. {Canis familiaris} ORIGINAL TRANSPARENCY LOST BEMROSE

Juergen Freund / Cleaner shrimp {Periclimenes sp} transparent on coral, Philippines, Indo pacific

Juergen Freund / Cleaner shrimp {Periclimenes pedersoni} transparent on coral, Caribbean

Juergen Freund / Cleaner shrimp {Periclimenes sp} completely transparent on coral, Philippines, Indo pacific

Emanuele Biggi / La Palma glass frog (Hyalinobatrachium valerioi) attached to underside of leaf, showing its transparency. Captive.

Emanuele Biggi / La Palma glass frog (Hyalinobatrachium valerioi) attached to underside of leaf, showing its transparency. Captive.

Emanuele Biggi / La Palma glass frog (Hyalinobatrachium valerioi)sitting on glass and displaying transparency of underside. Captive.

Emanuele Biggi / La Palma glass frog (Hyalinobatrachium valerioi) sitting on glass and displaying transparency of underside. Captive.

Emanuele Biggi / La Palma glass frog (Hyalinobatrachium valerioi) sitting on glass and displaying transparency of underside. Captive.

Emanuele Biggi / La Palma glass frog / Reticulated glass frog (Hyalinobatrachium valerioi) sitting on glass showing transparency of its belly. Captive.