举个例，他们根据现存的星椋鸟的毛色确定了一片有4.7亿年的羽毛有暗彩色光泽 。
They determined, for example, that a 47-million-year-old feather had the dark iridescent sheen found on starlings today.
但是有一种欧椋鸟却是可以在成年以后也能继续学习唱歌的。
Just a few passerines, such as the European Starling, "are capable of learning songs later in life".
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