날면서 잠을 자는 새
Frigatebirds fly for many days and sleep only a little.
Before you read
Before you read
군함조는 여러 날 동안 날 수 있어요. 바다 위를 날아요. 물 위에 앉을 수 없어요. 그러면 언제 잠을 잘까요?
과학자들은 새에게 작은 기계를 달았어요. 새들은 열흘까지 날아요. 날면서 잠을 자요. 뇌의 반만 잠을 자요. 한쪽 눈은 떠 있어요.
이것은 놀라워요. 바다에서 새는 하루에 사십 분만 자요. 육지에서는 열두 시간 넘게 자요. 집에서는 많이 쉬어요.
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