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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]
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 ...
Postural configuration of a Gray Reef Shark as it displays agonistic behaviour, in a sculpture (from Shark agonistic display) Image 9 Sharksucker (Echeneis naucrates) (from Shark agonistic display ) Image 10 A 14-foot (4.3 m), 1,200-pound (540 kg) tiger shark caught in Kāne'ohe Bay , Oahu , in 1966
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.
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]".
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