ភ្ជាប់​ទៅ​គេហទំព័រ​ទាក់ទង

Scientists announced that seven small teeth appeared in 21-million-year old rocks near the Panama Canal. The teeth belonged to a kind of monkey that should have only been in South America at that time. Scientists think the monkeys rode on rafts for at least 160 kilometers across the ocean to make the trip to North America.

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