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of, relating to, or belonging to the order Cuculiformes, which includes the cuckoos
Word Origin
from Latin cucūlus cuckoo + -form
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Encyclopedia Article for cuculiform

any member of a cosmopolitan group of birds containing two very distinct families, the cuckoos (Cuculidae) and the hoatzin (Opisthocomidae). Family Cuculidae is the much larger group, containing about 140 species of cuckoos, roadrunners, coucals, couas, malkohas, guiras, and anis; cuculids are found in the tropical and temperate zones of all the continents except Antarctica and on many oceanic islands. In contrast, family Opisthocomidae contains one species, found only in South America.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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