translation.en: And it's kind of cool -- if you look at the cassowary, or any of the birds that have crests on their heads, they actually grow to about 80 percent adult size before the crest starts to grow.
translation.zh: 食火鸡这种鸟很酷——事实上 所有头上有冠的鸟都很酷 因为它们直到 发育到成年个体的百分之八十的时候 头上的冠才会开始生长