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Flores Crow Corvus florensis Scientific name definitions

Steve Madge
Version: 1.0 — Published March 4, 2020
Text last updated January 1, 2009

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Field Identification

40 cm; c. 175 g. Small crow with relatively short bill with gently curving culmen, nostrils very long but concealed by dense nasal tuft (which extends half-way along side of upper mandible and overlaps base of culmen), relatively long tail and broad, rounded wings; plumage soft in texture. Plumage is purplish-black, not highly glossed, bases of neck feathers smoky grey; iris dark brown, tiny patch of bare skin behind eye; bill and legs black. Sexes similar. Juvenile apparently similar to adult, but information inadequate.

Systematics History

Along with C. typicus sometimes separated in Nesocorax. Relationships uncertain, possibly a separate lineage (1, 2); earlier thought perhaps to be an ancient derivative of the “C. enca complex”, but differs fundamentally in bill structure and plumage texture. Monotypic.

Subspecies

Monotypic.

Distribution

W Flores, in Lesser Sundas.

Habitat

Tall secondary and primary moist, semi-deciduous monsoon forest along watercourses; chiefly in lowlands, but occasionally in hills, to 950 m. Has been found in relict patches of tall forest in areas of short secondary growth, but such fragmentation probably unsuitable for long-term survival. Possibly also in forest habitats remaining in E Flores, which markedly drier.

Movement

Sedentary.

Diet and Foraging

No specific information on diet; most likely to consist of small invertebrates and small fruits. Forages in ones and twos, parties of up to five being family groups. Larger gatherings very rare, but 15 reported together in 1988. Feeds in tree canopy, both in crown and in subcanopy. Like C. typicus, its flight is rapid and direct with shallow whistling wingbeats.

Sounds and Vocal Behavior

Usual call a high-pitched, but downwardly inflected rasping "cwaaa" or "waaaak", repeated up to three times, delivered with downward tail-pumping or with head thrown back with each call. Sometimes gives elaborate resonant pumping and gurgling, which becomes progressively louder with repetition. Hoarse wheezing contact call also reported, as well as a drawn-out call likened to that of a wailing human baby.

Breeding

Season Sept–Jan. Nest constructed of sticks, built c. 12 m above ground; one documented nest was in isolated tree amid wooded cultivation but close to edge of forest. Clutch 2–3 eggs, usually 3. Nest sometimes parasitized by Channel-billed Cuckoo (Scythrops novaehollandiae) and possibly by Western Koel (Eudynamys scolopaceus). No other information.

ENDANGERED. Restricted-range species: present in Northern Nusa Tenggara EBA. Rare. Formerly found throughout Flores, but now virtually restricted to rainforests at extreme W end of the island, where occurs in four prime areas: Wolo Tadho Nature Reserve, Mbeliling, Sano Nggoang and Nggorang Bowosie (at E limit of regular recent sightings on N coast, with Kisol at E limit on S coast). Has been reported also from Wae Wuul Nature Reserve, near Mbura. It is important that further forest reserves are allocated or extended, and protection implemented. Until at least 1998 was present much farther E on N coast, at Mausambi, and could well exist as small pockets elsewhere in E and in interior and C parts of the island. A forest inhabitant, and has always had reputation for being rare and poorly known. Seems to be intolerant of forest clearance, and at most of its "regular" sites the impression is that it is definitely decreasing, presumably through forest fragmentation. Forest clearance has also allowed considerable range expansion of larger C. macrorhynchos on Flores, which could result in potential nest predation by latter. Present species reported as having reputation in some villages for stealing chicken eggs, and some villagers regard it as a pest and put out eggs laced with DDT to poison the crows. Rate of forest destruction on Flores is alarming; clearly, the only way to save this corvid is by creating large forest reserves and strictly enforcing logging controls, as well as through programmes aimed at increasing public awareness of the island's unique wildlife.

Distribution of the Flores Crow - Range Map
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  • Year-round
  • Migration
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Distribution of the Flores Crow

Recommended Citation

Madge, S. (2020). Flores Crow (Corvus florensis), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.flocro1.01
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