February 2005: Avian "IQ" Measurement and Hawk Intelligence
Ornithologist Louis Lefebvre introduced a method to assess avian intelligence in February 2005 by observing their feeding innovations. This method identified hawks as one of the most intelligent bird species.
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2005: Proposal to Restructure Buteoninae Subfamily
In 2005, Lerner and Mindell suggested reorganizing the Buteoninae subfamily. They proposed moving eagles and sea-eagles to separate subfamilies, Aquilinae and Haliaaetinae, leaving only buteonine hawks and buzzards in Buteoninae.