zygodactyl en · ADJ
Etymology
From zygo- + -dactyl.
Meanings
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(not-comparable) Having two toes pointing forward, and two pointing backward; zygodactylous.
In parrots, the tarsometatarsus has a distinct shape resulting from the particular arrangement of parrot toes. As zygodactyl birds, toes number 2 and 3 are facing forward, while toes 1 and 4 are facing backwards.
2016 November 16, Hanneke Meijer, “Sunny steppes? A tiny parrot fossil suggests Siberia was once subtropical”, in The Guardian: