Master Zhang, a retired miner, bought four chicks at the beginning of this year. One day he found one of them missing. He got very angry and kept blaming his wife for it.

退休煤矿工人张师傅今年年初买了四只小鸡，有一天发现丢了一只，气得一个劲地埋怨老伴。

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In 2008 four chicks hatched - but it's thought only three survived.

BBC: Derby Cathedral video proves peregrines hunt by night

Warblers whose nests were thus protected did well, raising an average of four chicks to maturity in the absence of a cowbird parasite.

ECONOMIST: How cowbirds run protection rackets

Twenty kittiwake chicks were hatched in captivity and assigned randomly to four fish diets: high-volume high-lipid, high-volume low-lipid, low-volume high-lipid, and low-volume low-lipid.

BBC: NEWS | Science/Nature | Birds hit by climate, diet shift