Red eyed tree frog developed vivid eyes to shock predators

Fun Fact - Many scientists believe the red-eyed tree frog developed its vivid scarlet peepers to shock predators into at least briefly, questioning their meal choice. ⁠
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These iconic rain-forest amphibians sleep by day, stuck to leaf-bottoms with their eyes closed and body markings covered. When disturbed, they flash their bulging red eyes and reveal their huge, webbed orange feet and bright blue-and-yellow flanks. This technique, called "startle coloration", may give a bird or snake pause, offering a precious instant for the frog to spring to safety.⁠
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Awesome to see these guys in Costa Rica! 🐸⁠

National Geographic