The Disappearing Frogs

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Glass frogs, which live in the rainforests of Central and South America, are known for their unusual skin. Seen from below, their skin is so clear that their hearts and other organs can be seen through it. Scientists had long been puzzled, however, by one part of these frogs that ( 1 ). Blood is red, and it flows throughout the body, so it should make even a animal easy to notice. In 2022, a team of researchers finally found the answer. Using special imaging equipment, they observed glass frogs while the animals were sleeping on leaves during the day. They discovered that the frogs move almost 90 percent of their red blood cells from their blood vessels into their , which is covered with a reflective surface. As a result, the frogs become two to three times more . When they wake up and start moving, ( 2 ). This allows them to stay hidden from birds and snakes while they rest and remain active at night. The discovery has also attracted the attention of medical researchers. In humans, when large numbers of blood cells gather in one place, they can form dangerous clots. The frogs, ( 3 ), pack their blood cells tightly together every day without any harmful effects. If scientists can understand how the frogs avoid this problem, it may lead to new treatments for conditions such as heart attacks and strokes.

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