Roy Mangersnes / Juvenile female Polar bear (Ursus maritimus) hunting for seals at breathing holes in the ice, Svalbard, Norway, March.
00977150
Norbert Wu / Scuba diver exploring ice caves below Weddell Seal (Leptonychotes weddellii) breathing holes, life below feeds on seal feces, Antarctica
01484689
Olga Kamenskaya / Hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April.
01484691
Olga Kamenskaya / People looking at hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April 2009.
01484603
Olga Kamenskaya / Hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April.
01425069
Franco Banfi / Plumose sea anemones (Metridium senile) under ice with cut breathing holes visible above, Arctic circle Dive Center, White Sea, Karelia, northern Russia
01282841
Bryan and Cherry Alexander / Inuit hunter checking seal net, Bushnan Island, Savissivik, Northwest Greenland, 1998.
01282837
Bryan and Cherry Alexander / Inuit hunter hauling dead seal from breathing hole near Cape York, Northwest Greenland.
01282620
Bryan and Cherry Alexander / Inuit hunters hauling Bearded seal (Erignathus barbatus) caught at breathing hole. Northwest Greenland, 1980.
01282612
Bryan and Cherry Alexander / Fur clad Inuk waiting to harpoon seal at breathing hole. Northwest Greenland, 1980.
01282625
Bryan and Cherry Alexander / Breathing hole in sea ice. Arctic seals have a network of these to avoid predators. Northwest Greenland, 1980.
00977068
Norbert Wu / Weddell Seal (Leptonychotes weddellii) mother and pup float in shallow water under sea ice crack, their breathing holes visible in background, Antarctica
00135614
Norbert Wu / Weddell Seal (Leptonychotes weddellii) at breathing hole, they sometimes fight to protect breathing holes, peering down to scan for rivals, Antarctica
00135612
Norbert Wu / Ice cave below Weddell Seal (Leptonychotes weddellii) breathing holes are filled with Sea Stars (Odontaster validus) and other life which feed on Seal feces, Antarctica
00135611
Norbert Wu / Ice cave below Weddell Seal (Leptonychotes weddellii) breathing holes is filled with Sea Stars (Odontaster validus) which feed on Seal feces, Antarctica
00135610
Norbert Wu / Weddell Seal (Leptonychotes weddellii) at breathing hole, they sometimes fight to protect breathing holes, peering down to scan for rivals, Antarctica
00135621
Norbert Wu / Sea Star (Odontaster validus) gather in ice caves below Weddell Seal breathing holes to feed on seal feces, Antarctica
00135617
Norbert Wu / Weddell Seal (Leptonychotes weddellii) at breathing hole, they sometimes fight to protect breathing holes, peering down to scan for rivals, Antarctica
00135615
Norbert Wu / Weddell Seal (Leptonychotes weddellii) at breathing hole, they sometimes fight to protect breathing holes, peering down to scan for rivals, Antarctica
00135603
Norbert Wu / Weddell Seal (Leptonychotes weddellii) breathing hole from underwater, seals maintain the holes with their teeth, Antarctica
00135602
Norbert Wu / Weddell Seal (Leptonychotes weddellii) breathing entry and exit holes, seals maintain the holes with their teeth, Antarctica
00135601
Norbert Wu / Weddell Seal (Leptonychotes weddellii) group near breathing entry and exit holes, seals maintain the holes with their teeth, Antarctica
08141658
David Fleetham / Short-finned pilot whale (Globicephala macrorhynchus) exhaling through blowhole at surface, Hawaii.
08138361
David Fleetham / Blowhole of Humpback whale (Megaptera novaeangliae), Hawaii.
00135613
Norbert Wu / Weddell Seal (Leptonychotes weddellii) at breathing hole, they sometimes fight to protect breathing holes, peering down to scan for rivals, Antarctica
01721603
Will Watson / Cranefly (Tipula sp.) larva, portrait showing breathing holes and appendages, River Frome, Bromyard, Herefordshire, England, UK. November. Controlled conditions using microscopy.
01673655
Doug Perrine / Fin whale (Balaenoptera physalus) breathing at surface with blow holes open to inhale, showing asymmetrical colour pattern: lower jaw is white on right side, Ligurian Sea, Mediterranean Sea, Italy.