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TIL some frogs in South/Central America have the rare ability to become nearly transparent when they're sleeping but look opaque reddish-brown when hopping around. Using light and ultrasound imaging technology they found the frogs concentrate their blood in their liver, draining them of most color.

https://mynbc15.com/news/offbeat/scientists-reveal-secrets-of-frog-transp…
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https://www.reddit.com/r/todayilearned/comments/1i648dd/til_some_frogs_in_southcentral_america_have_the/