小燕子，穿花衣。家燕的体型小巧，树麻雀和它比起来都会显得大一些。离得远，它们看起来黑黢黢的，下巴一撮儿红色很明显，离得近，在阳光的照射下，羽毛本身有色素沉淀，除此以外，羽毛的物理特质使得在一些角度看，因散射、干涉或衍射的产生出的结构色，复合呈现出五彩斑斓的蓝色。照片中可以看到羽毛部分：从结构上分类看是正羽，从功能上分类是飞羽。春季，燕子忙着筑巢抚育下一代，因此，它们会为了找寻建筑材料，多次往返很是辛苦。马上它们就要多起来了～#观鸟 #北京观鸟 #鸟类摄影 #家燕

你不知道的冷知识

小燕子，穿花衣。

家燕的体型小巧，树麻雀和它比起来都会显得大一些。

离得远，它们看起来黑黢黢的，下巴一撮儿红色很明显，离得近，在阳光的照射下，羽毛本身有色素沉淀，除此以外，羽毛的物理特质使得在一些角度看，因散射、干涉或衍射的产生出的结构色，复合呈现出五彩斑斓的蓝色。

照片中可以看到羽毛部分：从结构上分类看是正羽，从功能上分类是飞羽。

春季，燕子忙着筑巢抚育下一代，因此，它们会为了找寻建筑材料，多次往返很是辛苦。

马上它们就要多起来了～

#观鸟 #北京观鸟 #鸟类摄影 #家燕

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The lead from Wall Street offers little clarity as the major averages opened lower on Friday and then bounced back and forth across the unchanged line, finally finishing mixed and little changed.The Dow added 33.18 points or 0.10 percent to finish at 34,798.00, while the NASDAQ eased 4.54 points or 0.03 percent to close at 15,047.70 and the S&P 500 rose 6.50 points or 0.15 percent to end at 4,455.48. For the week, the Dow rose 0.6 percent, the NASDAQ added 0.1 percent and the S&P gained 0.5 percent.The lackluster performance on Wall Street came on uncertainty about the outlook for the markets following recent volatility.