
• (a.) Yoke-footed; having the toes disposed in pairs; -- applied to birds which have two toes before and two behind, as the parrot, cuckoo, woodpecker, etc.
Found on
http://thinkexist.com/dictionary/meaning/zygodactylous/

zygodactyl, zygodactylism, zygodactylous 1. With reference to certain climbing birds, having the toes of each foot arranged in pairs, with two toes in front and two behind. 2. A term sometimes used to designate simple syndactyly (webbing between adjacent digits so they are more or less completely attached), as distinguished from syndactyly in whic...
Found on
http://www.wordinfo.info/words/index/info/view_unit/2351/2

Having two toes directed forward and two backwards
Found on
https://birds.iitk.ac.in/glossary?page=257

yshaped, pincer like feet.
Found on
https://www.encyclo.co.uk/local/21694
No exact match found.