Cuckoo-roller
Leptosomus discolor
A large, big-headed, short-legged bird that is very odd in almost every way, especially in the position of the eye near the top of the head. Males have a pale head and underparts and a colorful iridescent back. Females are rufous brown with heavy spotting below. Found in all forest types, and sometimes in adjacent scrub and plantations. Often perches and feeds in the canopy, though rarely on an emergent branch. Males and pairs frequently make soaring display flights, constantly giving incredibly loud and persistent three-part wailing calls. Much larger than Broad-billed Roller, with a dark bill. Looks raptor-like, but has a huge head, small bill, and less powerful wingbeats.
Identification
The cuckoo-roller has a total length of 40–50 cm (16–20 in); the nominate subspecies is the largest, and L. d. gracilis the smallest. Unlike the true rollers and ground rollers, where the sexes have identical appearance, the cuckoo-roller is sexually dichromatic. Males have a mostly velvety grey chest and head, changing gradually to white on the remaining underparts (the demarcation between grey and white is stronger in L. d. gracilis). The back, tail, and wing-coverts are dark iridescent green with a purplish tinge (especially on the wing-coverts), and the crown and eye-stripe are black. Females are mostly brown, with strongly dark-spotted pale underparts (less spotting in L. d. gracilis). Juveniles are generally reported as resembling a dull female, but at least juveniles of L. d. gracilis are sexually dimorphic, and this also possibly applies to the other subspecies. The bill is stout and the eyes are set far back in the face. The legs and feet are small, and the feet have an unusual structure which has confused many ornithologists, but is now thought to be zygodactylous (two toes forwards, two toes backwards).
Taxonomy
- Scientific name
- Leptosomus discolor
- Authority
- (Hermann, 1783)
- Order
- Leptosomiformes
- Family
- Leptosomidae
- Genus
- Leptosomus
Range and habitat
The cuckoo-roller occupies a wide variety of habitats, including altered areas. They inhabit forest, including rainforest, litoral forest, deciduous forest, spiny bush-forest, and tree plantations. In the Comoros, the species is found on all the major islands, particularly in forested zones. It can be found from near sea level up to 2000 m.
- Migration
- Resident species
Behavior
The diet of the cuckoo-roller is not well known, but a 1931 expedition found that chameleons and insects, particularly locusts and caterpillars, are important food items. Stomachs have often been found to be lined with caterpillar hairs, and other prey taken include grasshoppers, cicadas, stick insects, and geckos. The principal foraging technique is to perch motionless, watching for prey, then to make a quick sally towards the prey when observed. They also hunt from the air. Prey is caught in the large bill and killed by beating it against a branch.<p>Very few studies have investigated the breeding habits of the cuckoo-roller. It has been described in the past as a polygamous breeder, but no evidence for this is available. The nest is located in tall trees, 4–6 m (13–20 ft) off the ground, in natural cavities. No lining is placed inside the cavity; the white eggs are laid directly on the bottom. The usual clutch size is around four eggs. Incubation is performed by the female only, while the male feeds her. The incubation period is about 20 days, after which fluffy chicks are born. Chicks remain in the nest for 30 days before fledging.
Conservation
The species is not generally hunted and has proven resistant to habitat change that has threatened other native birds. It is assessed as Least Concern by the IUCN. The distribution of the cuckoo-roller is vast, and populations in Madagascar persist in small forest fragments. Areas with abundant populations include broad expanses of forest associated with reserves such as Zahamena, Andringitra, Andohahela, and Marojejy.
- Population trend
- declining
Photos
Distribution
Bird Calls
Other Birds
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Stachyris thoracica
Handsome and well-named large babbler with a snow-white “bib.” Also note blue facial skin and bright chestnut back. Crown is brownish on birds from western Java, and grayish on those from central and eastern Java. Despite large size and bright colors, can be quite skulky and difficult to see well. Hops and clambers about in dense bushes and vines in foothill forests, typically in mid-sized groups, giving dry churring rattles. Also gives a short, fluty-sounding whistle.
Striated Starling
Aplonis striata
Small, dark starling with a bright red eye, short tail, and thick bill. Male glossy black with a faintly striated pattern. Female gray overall, slightly paler on the underparts. Found throughout New Caledonia and on the Loyalty Islands, though more common in areas of higher quality habitat. Most common call a surprisingly high-pitched, clear downslurred whistle. Also gives a more rarely-heard quiet babbling song.
Chaco Chachalaca
Ortalis canicollis
Large noisy bird with a long tail. Rather uniform brown plumage with little contrast between its head and the rest of the body. Inhabits swampy forest, savanna, and second growth, where found in groups which may exceed 30 individuals. Feeds on fruits and seeds on the ground or in trees. Gives a typical loud chachalaca song, a rollicking duet “bink, ka chee chaw raw taw, chaw raw taw, chaw raw taw.” Calls include a low “cha-cha-cha.”
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