回复：You have a heart of gold.

来源: bmdn 于 2012-09-16 14:06:39 [] [旧帖] [给我悄悄话] 本文已被阅读： 次 (274 bytes)
回答: You have a heart of gold. 由 北京二号 于 2012-09-16 13:49:29

Wild life's struggle for survive is always hard, even in predator-free urban environment. I'm not a scientist but I think 50% survival rate is not that bad. Different species has different survival rate. Fish spawn millions of eggs and very few of the grow into fish.

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