Glass frogs are not actually made of glass. But their skin is transparent (透明的), just like glass. In fact, the skin on the underside of a glass frog is so clear that you can see what is inside its body. Without using an X-ray machine, you can see the glass frog's heart and other organs.
The glass frog usually lives high in the trees above rivers. These unusual-looking glass frogs can be difficult to discover in the rainforest, because the clear skin on their fronts and the light green color of their backs often blend in (融入) with the leaves they rest on. Also, they are tiny—just about the size of a coin.
These frogs make up for their small size with an interesting way of catching insects. Scientists believe the glass frog's back looks like the frog's eggs. If a fly (苍蝇) flies down for a meal on the frog's back, it will be caught unexpectedly when the glass frog opens its mouth.
The glass frog's eggs are protected by the male (雄性的) glass frogs. Male glass frogs are very protective of their eggs. To protect the eggs, a male glass frog will try to scare away any other male frog that gets too close. At first, the male glass frog makes loud noises to warn the other male frog to leave his area. If that does not work, then the glass frogs may fight with each other until one gives up and leaves. These fights can last for thirty minutes.
①They blend in with the leaves they rest on.
②They are very tiny.
③They move fast.
④They seldom make noises.
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