No red blood cells = frog stealth mode.
“Hyalinobatrachium fleischmanni … tiny glass frogs — measuring between three-quarters of an inch and one-and-a-half inches — go into stealth mode when they’re asleep. When they snooze during the day, these little guys corral most of their red blood cells into their liver … Red blood cells reflect green light, so removing the pigmented cells from circulation lets the frogs’ translucent skin transmit more light.” #Biology
