Phát hiện dấu chân khủng long cách đây 70 triệu năm
Một dấu chân ba ngón của khủng long xưa khoảng 70 triệu năm đã được phát hiện tại công viên quốc gia Denali, Alaska, Mỹ, bằng chứng đầu tiên cho thấy lòai động vật này từng tung hoành ở đây.
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