Using light and ultrasound imaging technology, researchers have discovered how some frogs found in South and Central America have the rare ability to turn on and off their nearly transparent appearance.
Frog - Wikipedia
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Milk Frog
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How See-Through Glass Frogs Hide Their Red Blood From Predators - The New York Times
News Duke Institute for Brain Sciences
Scientists discover the secret power that makes glass frogs
Molecules Of Emotion: The Science Behind Mind-Body Medicine: Pert, Candace B.: 9780684846347: : Books
Scientists discover the secret power that makes glass frogs transparent
Tracking Trash: Flotsam, Jetsam, and the Science of Ocean Motion (Scientists in the Field): 9780547328607: Griffin Burns, Loree: Books