By combining data on all known bird species, this tree is the most impressive snapshot yet of one of Earth’s most awe-inspiring classes of animal.

Over the years, there have been so many conflicting trees of birds, she told me ... into aerodynamic insectivores with nearly identical silhouettes, but traits such as their vocal organs ...

Throughout the night, great potoos emit a loud, moaning growl that has earned the bird a mythical status, with some communities believing the sounds to be children calling for lost parents.