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The researchers' work is described in the Dec. 12, 2014, issue of Science.
The evolutionary history of birds such as the hoatzin (Opisthocomus hoazin; pictured) has been difficult to resolve. This special issue focuses on the avian phylogenomics project, which sequenced 45 bird species from all major avian clades. Using this data, studies analyzed the phylogenetic relationship of birds and explored aspects of avian biology. See page 1308.
Credit: Cover - Copyright AAAS 2014. Photo- Copyright Flip De Nooyer/Foto Natura/Minden Pictures/Corbis
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