In research funded by the european union , alessandro bottaro of the university of genoa in italy has devised small keratin bristles that mimic the smallest type of bird feathers , known as coverts .

欧盟资助的一项研究中，意大利热那亚大学的亚历山德罗波塔罗设计出一种微小型角质蛋白刷毛，他仿照了鸟身上叫做覆羽那种最小的羽毛。

I think only vivid niltava has such a narrow throat line and it seems normal for female to show contrastingly buffy undertail coverts .

我想只有黄腹琉璃有如此窄的喉线,而且对比鲜明地淡黄色翼下覆羽对母鸟似乎是正常的.

It also showed the more orange underwing coverts " said " to be indicative of red-rumped and what appeared to be a complete ( or nearly so ) nuchal collar .

它的翼下覆羽较偏橘色『据说』是金腰燕的特徵，而起它的颈圈看起来是完整相连（或是几乎相连）的。