Some creatures blend in by sticking out. Learn more about glass frogs and the special way they hide their blood.

The most transparent of the roughly ... its blood to render its body more translucent, hiding nearly 90 percent of its red blood cells inside its opaque liver during its daytime slumber.

Light can pass straight through transparent ... glass is translucent. It allows some light to pass through, but images of objects viewed through the frosted glass are not clear. Opaque close ...