Oscar Dewhurst / Long-eared owl (Asio otus) in flight over farmland. Durham, UK. May

Shane Gross / Head portrait of a Shaws seasnake (Lapemis curtus) underwater near Malapascua, Philippines.

Pascal Kobeh / Black finned snake eel (Ophichthus melanochir) buried in the sand, Sulu Sea, Philippines

Doug Perrine / Olive sea snake (Aipysurus laevis) and scuba diver on seamount, Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean.

Doug Perrine / Olive sea snake (Aipysurus laevis) on seamount, Kei Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean

David Fleetham / Freckled snake eel (Callechelys lutea) head poking out of sand with rest of body buried. Hawaii.

David Fleetham / Banded yellowlip sea snake / krait (Laticauda colubrina) in coral reef, Philippines.

Alex Mustard / Portrait of a butterfish (Pholis gunnellus) in seaweeds, on a chalk reef. Sheringham, north Norfolk, England, United Kingdom. North Sea

Tony Wu / Snake eel (Ophisurus macrorhynchos) waiting to ambush prey, head poking out of sand. Sue, Wakayama Prefecture, Kansai, Honshu, Japan. February.

David Fleetham / Yellowlip sea snake (Laticauda colubrina) on coral reef with Blue star (Linckia laevigata) Philippines. Venomous species.

David Fleetham / Crocodile snake eel (Brachysomophis crocodilinus), awaiting prey. Hawaii.

Alex Mustard / Portrait of a Clown snake eel (Ophichthus bonaparti) emerging from the seabed. Ambon Bay, Ambon, Maluku Archipelago, Indonesia. Banda Sea, tropical west Pacific Ocean.