Take a look at this Broomtail wrasse (Cheilinus lunulatus) from the Red Sea and compare it with the Dusky parrotfish (Scarus niger), below. Do you see any similarities? Both have a very bright and very visible yellow marking just behind the eye and above the pectoral fin. What function does this marking serve? Both are in roughly the same size class (fifty centimeters for the largest wrasses and forty for the parrotfish). The wrasse has
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