鸟类的亲缘关系研究

有些看似迥然不同的鸟类实际上是久违的亲戚，比如鲜艳的蜂鸟和褐色的欧夜莺。有些鸟类从未被联想在一起，但的确是近亲，例如鸣鸟和鹦鹉。其他行为习惯相似的鸟类．比如隼和其他食肉猛禽，则可能在基因上毫无瓜葛。

Birds of a Father

Some birds that look very different say, bright hummingbirds and drab nightjars are long-lost kin. Some never considered together, like songbirds and parrots, are really close relatives. Others that act similarly, such as falcons and other birds of prey, may be genetically unrelated.