The most dangerous kind of UV rays is UV-B. When they get past the ozone layer - frogs look out! Fur, feathers, clothes or sunscreen can stop UV-B. Frogs don't have any of these things to protect themselves.
UV-B rays are even more dangerous to frogs' eggs. The eggs don't have a hard shell to protect them. Most eggs are laid in shallow water, close to land. The UV-B rays have no problem getting to the eggs. UV-B rays can stop frog eggs from hatching.
Scientists also think UV-B rays can cause frogs to be born with extra legs or make other weird things happen to their bodies.
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