Barry Bland / Fried egg jelly fish (Cotylorhiza tuberculata) Mediterranean Sea.

Fred Bavendam / Egg-yolk Jellyfish (Phacellophora camtschatica), Saanich Inlet, British Columbia, Canada

Jeff Rotman / Fried egg jellyfish {Cotylorhiza tuberculata} in open ocean, Italy, Mediterranean

Jeff Rotman / Fried egg jellyfish {Cotylorhiza tuberculata} in open ocean, Italy, Mediterranean

Jeff Rotman / Stinging nematocysts on Fried egg jellyfish, Italy {Cotylorhiza tuberculata}

Joel Sartore / Photo Ark / Mediterranean jellyfish (Cotylorhiza tuberculata) underside portrait, Loro Parque's Aquarium, Tenerife. Captive.

Joel Sartore / Photo Ark / Mediterranean jellyfish (Cotylorhiza tuberculata) underside, portrait, Loro Parque's Aquarium, Tenerife. Captive.

Joel Sartore / Photo Ark / Three Mediterranean jellyfish (Cotylorhiza tuberculata) portrait, Loro Parque's Aquarium, Tenerife. Captive.

Shane Gross / Fried egg jellyfish (Phacellophora camtschatica), portrait, Vancouver Island, British Columbia, Canada, Pacific Ocean.

Shane Gross / Fried egg jellyfish (Phacellophora camtschatica) off Vancouver Island, Canada

Franco Banfi / Mediterranean jelly or fried egg jellyfish (Cotylorhiza tubercolata) Massa Lubrense, Punta Campanella Marine Protected Area, Costa Amalfitana, Italy, Tyrrhenian Sea, Mediterranean.

David Hall / Fried Egg Jellyfish (Phacellophora camtschatica) viewed from below; Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.

Ernie Janes / Abstract photo of Tower Bridge, with blurred motion red bus, London, June 2013. Digitally manipulated.

David Woodfall / Mute Swans (Cygnus olor) swimming in Worcester city centre, during February 2014 floods, Worcester, England, UK, 10th February 2014.

Laurent Geslin / Common bluebottle {Calliphora vomitoria} on window pane, UK

Milan Radisics / Long-eared Owls (Asio otus) roosting in tree, Szeged city, Southern Hungary, February 2009

Igor Shpilenok,Igor Shpilenok / Red Foxes (Vulpes vulpes) fighting outside ranger cabin window. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, February.

Jouan & Rius / Two Domestic cats outdoors looking in through window, France

Ashley Cooper / Triple glazed windows in old farmhouse refurbished to be as environmentally friendly as possible. Grayrigg, Cumbria, England, UK, April 2012.

Ashley Cooper / Triple glazed windows in old farmhouse refurbished to be as environmentally friendly as possible. Grayrigg, Cumbria, England, UK, April 2012.

Hugh Pearson / Aerial of Mount Namuli taken from within helicopter, Mount Namuli, Mozambique, May 2011.

Fabrice Cahez / Eurasian hoopoe (Upupa epops) flying into window, Vosges, France, June.

Paul Hobson / Small tortoishell butterfly (Aglais urticae) on a stained glass window of church on a sunny day Sheffield, England, UK, January.

Staffan Widstrand / Kittiwakes (Rissa tridactyla) nesting on wall of house, Vardo town, Varanger Peninsula, Norway, March.