Glass Frogs Transparency

This combination of photos provided by researchers in December 2022 shows the same glass frog photographed during sleep, under anesthesia, and while active (in transmitted light), showing the difference in red blood cells within the circulatory system. Some frogs found in South and Central America have the rare ability to turn on and off their nearly transparent appearance, researchers report Thursday, Dec. 22, 2022, in the journal Science. (Jesse Delia/AMNH via AP) AP PROVIDES ACCESS TO THIS THIRD PARTY PHOTO SOLELY TO ILLUSTRATE AP STORY "GLASS FROGS TRANSPARENCY" TRANSMITTED ON DEC. 22, 2022; MUST BE USED WITHIN 14 DAYS FROM TRANSMISSION; NO ARCHIVING; NO LICENSING; MANDATORY CREDIT

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