Researchers Discover World’s Oldest Tadpole — VOA Learning English
Topics: наука й природа
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Scientists in Argentina have discovered the oldest-known remains of the tadpole. The animal belonged to a large frog species that lived alongside dinosaurs about 161 million years ago.
The researchers said the 16-centimeter-long tadpole died during the larval period, or stage, of frog development. The discovery is providing new information about the development of frogs and toads.
The remains suggest tadpoles today are largely unchanged from their ancestors in the ancient time called the Jurassic period. The oldest-known frog remains date back even further, though no older tadpole fossils have been found.
The remains are in good condition. In fact, researchers say, the ancient tadpole has some…
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