鹀总科——润和反向润的活教材

Emberizoidea is a superfamily of passerines that are referred to as the New World nine-primaried oscines that includes majority of endemics which are exclusive to the New World. Nearly 892 species belong to this group as it includes buntings, American sparrows, the New World blackbirds, the parulid warblers, the cardinals, and the tanagers. The group originated after a rapid speciation event in North America after arriving from Eurasia via Bering strait during the Miocene epoch. Two groups from within the emberizoids diversified further in the Neotropics where one clade comprising several small Caribbean endemic species and the other, the tanager-cardinal group, in South America. Another two families, the Emberizidae (buntings) and the Calcariidae (longspurs and snow buntings), return to Eurasia and colonized.[1]
鹀总科为雀形目下的一个总科，也被称为9初级飞羽鸣禽（翅膀上有9根初级飞羽，而一般雀形目都有10根），涵盖了新大陆（指美洲）土著鸟类的绝大多数物种。目前该总科包含892个物种，包括鹀，雀鹀（英文里字面意思是美洲麻雀），拟鹂（这里用的英文是新大陆鸫），森莺，北美红雀（主教鸟）以及裸鼻雀。从欧亚地区经由白令海峡润到北美后，这个总科的初期类群在中新世经历了一个迅速的种群分化事件。其中的两个鹀形类群在新热带界（指美洲的高纬度地带）进一步分化，一个类群包含了加勒比的土著鸟类，另一个类群则是南美洲的北美红雀-裸鼻雀类群。另外两个科，即鹀科和铁爪鹀科，则反向润回了欧亚老家并定居化。

那么反向润的下场是什么呢？

而润能让你获得什么呢？