Glassfrogs hide red #blood #cells in their liver to become transparent https://phys.org/news/2022-12-glassfrogs-red-blood-cells-liver.html
Glassfrogs conceal blood in their liver to maintain transparency https://www.science.org/doi/10.1126/science.abl6620
When #glassfrogs are resting, their #muscles and #skin become #transparent, and their #bones, #eyes and internal #organs are all that's visible. If these #frogs are awake, stressed or under #anesthesia their #CirculatorySystem is full of #RedBloodCells and they are opaque.
