The cuckoo-roller is a solitary evolutionary line that defies its misleading common name.

Nature · Published 3 October 2026 Swipe more like this →

In short: Despite its name, the cuckoo-roller is neither a cuckoo nor a roller. This medium-large bird, found in Madagascar and the Comoros, occupies its own unique biological order, Leptosomiformes. It sits at the root of a major avian group, yet it remains a mysterious, often misunderstood inhabitant of island forests.

The cuckoo-roller, or courol, is the sole member of the family Leptosomidae. For years, scientists struggled to classify it, often grouping it with rollers due to superficial similarities. However, modern phylogenomic research places it in the distinct order Leptosomiformes, serving as the evolutionary root for a diverse group that includes trogons, hornbills, woodpeckers, and true rollers. This taxonomic isolation highlights how little we truly understand about this bird's deep history.

Physically, the species is defined by sexual dimorphism, a trait that separates it from true rollers. Males display iridescent green plumage with black crowns, while females are predominantly brown with spotted underparts. Their feet are zygodactylous, featuring two toes facing forward and two backward, a structure that has long puzzled ornithologists. They are opportunistic hunters, often perching motionless to scan for prey like chameleons, locusts, and geckos, which they dispatch by beating against branches.

Breeding habits remain largely anecdotal. While historical accounts suggested polygamy, evidence is currently lacking. We know they nest in tall tree cavities, laying a clutch of about four eggs. The female handles incubation for approximately 20 days while the male provides food. Despite these gaps in scientific knowledge, the bird is culturally significant in Madagascar, where it is viewed as a positive omen associated with clear weather and romantic partnerships.

The species is remarkably resilient, thriving in varied habitats from rainforests to plantations, and is classified as Least Concern by the IUCN. It is found from sea level up to 2,000 meters, persisting even in fragmented forests. Because they are generally tame and not hunted, they remain a common sight in protected areas like the Zahamena and Marojejy reserves, continuing to fascinate those who encounter them.

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