The detailed family tree of modern birds has however confused biologists for centuries and the molecular details of how birds arrived at the spectacular biodiversity of more than 10,000 species is barely known. (sciencedaily.com)
To figure out that number, researchers looked at more than 950 species across the mammal family tree for the presence of the bone. (sciencemag.org)
By comparing mutations from enough people, researchers can construct family trees with roots that reach back to the earliest modern humans. (sciencemag.org)