Cuckoos belong to the Cuculidae family, the only group in the Cuculiformes order. This family includes various birds like roadrunners and koels. Sometimes, coucals and anis are classified in separate families. The Cuculiformes order is part of a larger group called Otidimorphae, which also includes turacos and bustards. With 150 species across 33 genera, the Cuculidae family showcases a diverse range of these birds.
The cartoon duo "Wile E. Coyote and the Road Runner," created by Warner Bros. Studios in 1949, became a long-running series and a significant part of American popular culture, shaping the image of the roadrunner, a type of cuckoo.
In 1962, Sonny the Cuckoo Bird was introduced as the mascot for General Mills' Cocoa Puffs cereal, six years after the cereal's launch.
In 2005, Michael Sorenson and Robert Payne conducted a study using mitochondrial DNA sequences to understand the phylogenetic relationships between different genera of cuckoos.
A 2014 genome analysis conducted by Erich Jarvis and collaborators identified a new bird clade named Otidimorphae, which includes the orders Cuculiformes (cuckoos), Musophagiformes (turacos), and Otidiformes (bustards). The exact relationships between these orders remain unclear.
In 2014, a 16-year dataset revealed that carrion crow nests in northern Spain were more likely to successfully produce at least one crow fledgling when parasitized by great spotted cuckoos. The study attributed this to a predator-repelling substance secreted by cuckoo chicks. This complex relationship, not simply parasitic or mutualistic, wasn't observed in other host species or cuckoo species.