The taxonomy is somewhat inexact, with proposals for changes in classification as late as 2018<ref>http://checklist.aou.org/assets/proposals/PDF/2018-C-amended.pdf</ref>. At one time authorities placed the [[swallow-tailed kite]] (''Elanoides forficatus'') within the subfamily [[Milvinae]]. Several authorities consider the three [[vulture]] species of the subfamily [[Gypaetinae]] to be a part of Perninae<ref>http://www-personal.umich.edu/~hlerner/LM2005.pdf</ref>.
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The taxonomy is somewhat inexact, with proposals for changes in classification as late as 2018.<ref>http://checklist.aou.org/assets/proposals/PDF/2018-C-amended.pdf</ref> At one time authorities placed the [[swallow-tailed kite]] (''Elanoides forficatus'') within the subfamily [[Milvinae]]. Several authorities consider the three [[vulture]] species of the subfamily [[Gypaetinae]] to be a part of Perninae.<ref>http://www-personal.umich.edu/~hlerner/LM2005.pdf</ref>