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A great white shark is countershaded, with a dark gray dorsal color and light gray to white underside, making it more difficult for the shark's prey to see it as approaches from above or below in the water column. The particular undulations of the countershading line along its side, where gray meets white, is unique to each shark and helps researchers to identify individual sharks in capture-recapture studies. Guadalupe Island is host to a relatively large population of great white sharks who, through a history of video and photographs showing their countershading lines, are the subject of an ongoing study of shark behaviour, migration and population size.
Image ID: 19484
Species: Great white shark, Carcharodon carcharias
Location: Guadalupe Island (Isla Guadalupe), Baja California, Mexico | Hypostyle hall, Karnak Temple, Luxor, Eqypt.
Image ID: 02584
Location: Luxor, Egypt | Hypostyle hall, Karnak Temple.
Image ID: 02592
Location: Luxor, Egypt |
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Hypostyle hall, Karnak Temple.
Image ID: 02593
Location: Luxor, Egypt | Hypostyle Hall of Columns, Karnak Temple complex.
Image ID: 18477
Location: Luxor, Egypt | Hypostyle Hall of Columns, Karnak Temple complex.
Image ID: 18482
Location: Luxor, Egypt |
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Luxor Temple, statues and columns at night.
Image ID: 18484
Location: Luxor, Egypt | The Astoria Column rises 125 feet above Coxcomb Hill, site of the first permanent American Settlement west of the Rockies, itself 600 feet above Astoria. It was erected in 1926 and has been listed in the National Register of Historic Places since 1974. The column displays 14 scenes commemorating important events in the history of Astoria in cronological order. An interior 164-step spiral staircase leads to the top of a viewing platform with spectacular views.
Image ID: 19444
Location: Astoria, Oregon, USA | The Astoria Column rises 125 feet above Coxcomb Hill, site of the first permanent American Settlement west of the Rockies, itself 600 feet above Astoria. It was erected in 1926 and has been listed in the National Register of Historic Places since 1974. The column displays 14 scenes commemorating important events in the history of Astoria in cronological order. An interior 164-step spiral staircase leads to the top of a viewing platform with spectacular views.
Image ID: 19445
Location: Astoria, Oregon, USA |
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The Astoria Column rises 125 feet above Coxcomb Hill, site of the first permanent American Settlement west of the Rockies, itself 600 feet above Astoria. It was erected in 1926 and has been listed in the National Register of Historic Places since 1974. The column displays 14 scenes commemorating important events in the history of Astoria in cronological order. An interior 164-step spiral staircase leads to the top of a viewing platform with spectacular views.
Image ID: 19446
Location: Astoria, Oregon, USA | Sheepeater Cliffs, an example of columnar jointing in basalt due to shrinkage during cooling.
Image ID: 19794
Location: Yellowstone National Park, Wyoming, USA | Basaltic columns, Los Arcos del Diablo.
Image ID: 06188
Location: Guadalupe Island (Isla Guadalupe), Baja California, Mexico |
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Basaltic columns, Los Arcos del Diablo.
Image ID: 06187
Location: Guadalupe Island (Isla Guadalupe), Baja California, Mexico | Basaltic columns, Los Arcos del Diablo.
Image ID: 06192
Location: Guadalupe Island (Isla Guadalupe), Baja California, Mexico | Calcite stalactites hanging from above have joined with stalagmites growing on the cave floor to form a solid column.
Image ID: 09922
Location: Crystal Cave, Sequoia Kings Canyon National Park, California, USA |
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Norris topsnail (aka, kelp snail), clings to a kelp pneumatocyst (bubble) at the base of a stipe/blade, midway in the water column.
Image ID: 10212
Species: Norris' top snail, Norrisia norrisi, Macrocystis pyrifera
Location: San Nicholas Island, California, USA | Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10215
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA | Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10216
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA |
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Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10220
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA | Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10223
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA | Norris topsnail (aka, kelp snail), clings to a kelp pneumatocyst (bubble) at the base of a stipe/blade, midway in the water column.
Image ID: 10213
Species: Norris' top snail, Norrisia norrisi, Macrocystis pyrifera
Location: San Nicholas Island, California, USA |
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Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10217
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA | Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10221
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA | Northern kelp crab crawls amidst kelp blades and stipes, midway in the water column (below the surface, above the ocean bottom) in a giant kelp forest.
Image ID: 10222
Species: Northern kelp crab, Pugettia producta, Macrocystis pyrifera
Location: San Nicholas Island, California, USA |
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