Hot Bird is not alone.

热鸟并不是个例。

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Some said the Blue Jay must be a very special bird or maybe not a bird at all because he alone had kept his true color.

一些人说这只冠蓝鸦肯定是一只非同寻常的鸟，或者可能根本就不是鸟类，因为只有它保持了原来的颜色。

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Some people choose to walk alone. Others take part in group explorations led by bird experts.

VOA: special.2009.06.01

While the Nature study looked at how a bird flu virus could become airborne through mutations and re-assortment with other viruses, the Science study suggests mutations alone could do the trick.

CNN: Bird flu research resumes -- but not in U.S.