The Strange World of Glass Frogs.
Scientists have discovered that tiny glass frogs in Central and South America can make their bodies almost transparent while they sleep by diverting most of their red blood cells to their liver, which grows in size by around 40%. The researchers used photoacoustic microscopy to study the animals while they were asleep and under anaesthetic, and found that they became 34% to 61% more transparent while snoozing. The team hopes that further research on the frogs could help advance blood clot research in humans.
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