熟す前に毒成分があるのは、種(シュ)を守るためだと思います。
(2019年10月22日 訂正:
Before the fruit ripens, it contains poisonous saponin, but when it ripens the poisonous ingredient disappears and becomes a good food for birds.
I think that there is a poison before ripening to protect the species.
The fruits of
(Corrected on October 22, 2019 :
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