问题描述：
It's a small and green animal.It lives in the river or near the river.It can swim and hop.
It cries loudly.But its baby is black and it can't cry.The Mum and the baby don't look the same.What is it?Guess,please.
它是什么?
It cries loudly.But its baby is black and it can't cry.The Mum and the baby don't look the same.What is it?Guess,please.
它是什么?
问题解答：
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