zy·go·dac·tyl /ˌzaɪgəˈdæktḷ/
  (a.)攀木類鳥,[鸚鵡等]
  Zyg·o·dac·tyl, Zyg·o·dac·tyle  n.  Zool. Any zygodactylous bird.
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  zygodactyl
       adj : (of bird feet) having the first and fourth toes directed
             backward the second and third forward [ant: heterodactyl]