A small brown frog squats motionless in a den of green moss. It inhales no breath, has no heartbeat, yet it is not dead. Rock hard and icy to the touch, this speckled North American wood frog is ...
The common aspect, which is why they are called crystal frogs, is that their lower part (belly) is translucent, which allows us to observe the functioning of their organs: heart (red), liver ...
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