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The grey reef shark or gray reef shark (Carcharhinus amblyrhynchos, sometimes misspelled amblyrhynchus or amblyrhinchos) [2] is a species of requiem shark, in the family Carcharhinidae. One of the most common reef sharks in the Indo-Pacific , it is found as far east as Easter Island and as far west as South Africa .
Ibexes are effectively flattened by countershading, making them nearly invisible against a desert background. There are three in the image. Countershading is observed in a wide range of animal groups, both terrestrial, such as deer, and marine, such as sharks. [17] It is the basis of camouflage in both predators and prey. [18]
Countershading is widely used by terrestrial animals, such as gazelles [94] and grasshoppers; marine animals, such as sharks and dolphins; [95] and birds, such as snipe and dunlin. [96] [97] Countershading is less often used for military camouflage, despite Second World War experiments that showed its effectiveness.
In the 41 million square miles of Atlantic Ocean, Gray’s Reef National Marine Sanctuary amounts to a mere speck. But the 11,000-acre square-shaped preserve, 19 miles off the Georgia coast, is a ...
Postural configuration of a Gray Reef Shark as it displays agonistic behaviour, in a sculpture. Agonism is a broad term which encompasses many behaviours that result from, or are triggered by biological conflict between competing organisms. [1] [2] It is defined as "survivalist animal behaviour that includes aggression, defense, and avoidance [3]".
This grey reef shark demonstrates countershading, with its darker dorsal surface and lighter ventral surface. Sharks may have a combination of colors on the surface of their body that results in the camouflage technique called countershading. A darker color on the upper side and lighter color on the underside of the body helps prevent visual ...
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