Chestnut-crowned gnateater

The chestnut-crowned gnateater (Conopophaga castaneiceps) is a species of bird in the family Conopophagidae. It is found in Colombia, Ecuador, and Peru.[3]

Chestnut-crowned gnateater
Male (above) and female (below)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Passeriformes
Family: Conopophagidae
Genus: Conopophaga
Species:
C. castaneiceps
Binomial name
Conopophaga castaneiceps
Subspecies

See text

Taxonomy and systematics

The position of the chestnut-crowned gnateater in linear format is unsettled. The International Ornithological Committee (IOC) and the Clements taxonomy place it differently within the gnateater family.[3][4]

Four subspecies are recognized, though birds on the western slope of Colombia's Central Andes might be an unnamed taxon[5]:

Description

The chestnut-crowned gnateater is 13 to 14 cm (5.1 to 5.5 in) long. The mean weight of seven specimens was 27.6 g (0.97 oz). The male of the nominate subspecies has brown upper parts; a gray face, throat, and chest; and orange-brown flanks and vent area. The top of the head is orange-red and there is a white tuft behind the eye. C. c. chapmani has a brighter (less brown) crown. C. c. brunneinucha's orange-red is only the forehead; it is darker overall and has a white patch on the belly. C. c. chocoensis is similar to brunneinucha but is smaller, has less gray, has a more olive tinge to the back, and more orange-red on the crown. The female's head and chest are orange-red and the belly is whitish. The white plume behind the eye is smaller than that of the male.[5]

Distribution and habitat

The chestnut-crowned gnateater occurs in discontinuous areas from central Colombia to south-central Peru. C. c. chocoensis is found in Colombia on the western slope of the Western Andes and in the Serranía del Baudó of western Chocó Department. C. c. castaneiceps is found in Colombia's Central and Eastern Andes and into Ecuador. C. c. chapmani is found on the east slope of the Andes from southern Ecuador to the Department of San Martín in northern Peru. C. c. brunneinucha is found on the east slope of the Peruvian Andes from Huánuco south to Cuzco. It inhabits subtropical and tropical rainforest. Though it lives in the forest interior, it prefers smaller vegetation there in openings such as regrowing landslides. It ranges in elevation mostly between 1,000 and 2,000 m (3,300 and 6,600 ft) but has been found as low as 500 to 600 m (1,600 to 2,000 ft) in Colombia and Ecuador and as high as about 2,200 m (7,200 ft) in Peru.[5]

Behavior

Feeding

The chestnut-crowned gnateater forages for arthropods in leaf litter and foliage on and near the ground.[5]

Breeding

Little is known about the chestnut-crowned gnateater's breeding phenology. A nest found in February in Colombia was a hidden cup placed less than 1 m (3.3 ft) above ground. Birds were noted in breeding condition between March and June in Colombia's Central Andes.[5]

Vocalization

The chesnut-crowned gnateater's song is "a series of frog-like, slightly disyllabic notes" that accelerate and get louder after the first one or two notes.[9] Its calls include a "harsh 'zhiek!'"[10] and a "lower 'schek'".[11][5]

Status

The IUCN has assessed the chestnut-crowned gnateater as being of Least Concern.[1] It is not common in parts of its range but does occur in at least one protected area. It might benefit from the dense vegetation that grows in human-disturbed areas.[5]

References
  1. BirdLife International (2016). "Chestnut-crowned Gnateater Conopophaga castaneiceps". IUCN Red List of Threatened Species. 2016. Retrieved 7 May 2021.
  2. Sclater, Philip Lutley (1857). "Characters of some apparently New Species of American Ant-Thrushes". Proceedings of the Zoological Society of London. 25: 47.
  3. Gill, F.; Donsker, D.; Rasmussen, P. (January 2021). "IOC World Bird List (v 11.1)". Retrieved January 14, 2021.
  4. Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2019. The eBird/Clements Checklist of Birds of the World: v2019. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ Retrieved August 15, 2019
  5. Whitney, B. (2020). Chestnut-crowned Gnateater (Conopophaga castaneiceps), 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.chcgna1.01 retrieved May 7, 2021
  6. Chapman, Frank M. (1915). "Diagnoses of apparently new Colombian birds. IV". Bulletin of the American Museum of Natural History. 34 (23): 641–642.
  7. Carriker, M. A. Jr. (1933). "Descriptions of New Birds from Peru, with Notes on Other Little-Known Species". Proceedings of the Academy of Natural Sciences of Philadelphia. 85: 13–15. JSTOR 4064167.
  8. von Verlepsch, Graf Hans; Stolzmann, Jean (1896). "On the Ornithological Researches of M. Jean Kalinowski in Central Peru". Proceedings of the Zoological Society of London: 385–386.
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