Bird familly tree
Experts used the family tree to map out where the almost 10,000 species of birds live to show where the most diversification has taken place in the world.
Researchers, from the University of Sheffield, Yale University, University of Tasmania and Simon Fraser University, say the creation of new species has speeded-up over the last 50 million years. Surprisingly, species formation is not faster in the species rich tropics, but was found to be faster in the Western Hemisphere compared to the Eastern Hemisphere as well as on islands.
source : W. Jetz and all, The global diversity of birds in space and time, Nature.