Glassfrogs make themselves transparent while they rest by taking red blood cells from circulation and concealing them in their livers. A multi-disciplinary team of biologists and biomedical ...

"If you really want to be transparent, you need to hide your red blood cells," study co-author Sönke Johnsen, a professor of biology at Duke University in North Carolina, told Live Science.

Red blood cells in the circulatory system make it difficult for most animals to become transparent. These cells are good at absorbing green light, which is the colour of light normally reflected ...