American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Having two toes projecting forward and two projecting backward, as certain climbing birds.
- n. A zygodactyl bird, such as a parrot.
Century Dictionary and Cyclopedia
- In ornithology, yoke-toed: noting those birds, or the feet of those birds, which have the toes disposed in pairs, two before and two behind. In all yoke-toed birds, excepting the trogons, it is the outer anterior toe which is reversed; in trogons, the inner anterior one. See cut under
- n. A yoke-toed bird; a bird having the toes arranged in pairs.
- adj. Having two toes pointing forward, and two pointing backward; zygodactylous.
- n. ornithology Any such bird (such as the parrot.)
GNU Webster's 1913
- n. (Zoöl.) Any zygodactylous bird.
- adj. (of bird feet) having the first and fourth toes directed backward the second and third forward
- From zyg- + Ancient Greek δάκτυλος (dáktulos, "finger"). (Wiktionary)
“According to Britannica.com this arrangement is called zygodactyl and is typical of parrots, woodpeckers, cuckoos and a few other kinds.”
“Wood peckers and other birds that climb tree trunks often have these zygodactyl toes.”
“He suggested that it evolved semi-zygodactyl feet from an anisodactyl ancestral roller because its large size and specialisation for arboreal life required improved perching abilities.”
“It's superficially similar to true rollers (Coraciidae) and ground-rollers (Brachypteraciidae) but, unlike them, has semi-zygodactyl feet (though it has frequently very depicted inaccurately by artists who, in the absence of better information, have assumed that it's anisodactyl, like true rollers).”
“Like all parrots, they are zygodactyl, having 4 toes on each foot - two front and two back.”
“Given the strong sexual dimorphism and barred, brown female plumage of the Courol, its semi-zygodactyl feet, strong, reinforced jaws, and habit of eating caterpillars, this proposed link - which, ironically, puts the Coural back where it started in 1783 - is intriguing (cuckoos have really interesting jaws, as do the possibly related turacos and hoatzins) [sexual dimorphism in the cuckoo”
These user-created lists contain the word ‘zygodactyl’.
Origin: Gk zygÅ-, var. s. of zygoÃ»n
relating to joining or pairing
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