The logic was that the eagle thought his head was a stone, wanting to kill the livetortoise by dropping it.
人们的推理是老鹰以为他的头是块石头，想把活乌龟空投到上面摔死。
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The lifespan of an African Spurred Tortoise is about 30-50 years, though can live much longer - the oldest in captivity is 54 years, located in the Giza Zoological Gardens, Egypt, 1986.