Doug Perrine / RF- Atlantic sailfish (Istiophorus albicans) attacking bait ball of Spanish sardines (Sardinella aurita) near Yucatan Peninsula, Mexico, Caribbean Sea. (This image may be licensed either as rights man...
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Chris Newbert / Underwater reef scene with Sea Whips, Gorgonian Whip Coral, blossoming Soft Corals, Guard Plate Coral, and schools of Pseudanthias, Red Sea, Egypt
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Norbert Wu / Blue Marlin (Makaira nigricans), Bahamas, Caribbean
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Norbert Wu / Blue Marlin (Makaira nigricans), Bahamas, Caribbean
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Roger Powell / Greater black backed gull (Larus marinus) on guard over nesting territory, Great Saltee Island, Wexford, Republic of Ireland, June
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Nick Upton / Developing eggs of Cornish sucker fish / Shore clingfish (Lepadogaster lepadogaster) attached to the underside of a boulder in a rockpool low on the shore where a parent stays to guard them, near Falm...
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Nick Upton / Developing eggs of Cornish sucker fish / Shore clingfish (Lepadogaster lepadogaster) attached to the underside of a boulder in a rockpool low on the shore where a parent stays to guard them, near Falm...
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Nick Upton / Developing eggs of Cornish sucker fish / Shore clingfish (Lepadogaster lepadogaster) attached to the underside of a boulder in a rockpool low on the shore where a parent stays to guard them, near Falm...
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Kirkendall-Spring / Old coast guard buildings, which are currently park service buildings with the lighthouse on East Anacapa Island in background, Channel Islands National Park, California, USA, April 2011.
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Alex Mustard / 2020VISION / Female Common cuttlefish (Sepia officinalis) laying black eggs amongst seaweed, while male stands guard, Babbacombe, Torbay, Devon, UK, May
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Bryan and Cherry Alexander / Safety guard watching for Polar bears while tourists from Russian icebreaker walk on sea ice. North Atlantic, 1998.
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Wild Wonders of Europe / Zankl / Nests of the Loggerhead sea turtle (Caretta caretta) caged by volunteers who guard the beach at night. Cirali beach, Turkey, August 2009
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Doug Perrine / RF- Atlantic sailfish (Istiophorus albicans) hunting sardines, off Yucatan Peninsula, Mexico, Caribbean Sea. (This image may be licensed either as rights managed or royalty free.)
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Norbert Wu / Blue Marlin (Makaira nigricans), Bahamas, Caribbean
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Norbert Wu / Blue Marlin (Makaira nigricans), Sea of Cortez, Baja California, Mexico
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Norbert Wu / Coast Guard icebreaker cutting through sea ice, creates an ice channel that allows marine life to travel deeper into sea ice, McMurdo Sound, Antarctica