Chiriqui foliage-gleaner
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Furnariidae
Genus: Automolus
Species:
A. exsertus
Binomial name
Automolus exsertus
Bangs, 1901

The Chiriqui foliage-gleaner (Automolus exsertus) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Costa Rica and Panama.[1]

Taxonomy and systematics

The Chiriqui foliage-gleaner was originally described as a species but soon was reconsidered as a subspecies of what is now the ochre-throated foliage-gleaner (A. ochrolaemus).[2] A 2017 publication detailed significant differences in its plumage and vocalizations from the other ochre-throated subspecies.[3] Based on that data, the North American Classification Committee of the American Ornithological Society, the International Ornithological Committee, and the Clements taxonomy elevated it to a full species.[4][1][5] As of late 2023, BirdLife International's Handbook of the Birds of the World (HBW) still treats the taxon as a subspecies of A. ochrolaemus, which it calls the buff-throated foliage-gleaner.[6]

The Chiriqui foliage-gleaner is monotypic.[1]

Description

The Chiriqui foliage-gleaner is 18 to 20 cm (7.1 to 7.9 in) long and weighs 30 to 46 g (1.1 to 1.6 oz). It is a fairly large member of its genus and has a heavy bill. The sexes have the same plumage. Adults have a mostly dark brownish face with a bold buff eyering, faint reddish streaks on the ear coverts, and a slightly buffy malar area. Their crown and nape are dark brown with a faint blackish brown scallop pattern. Their back and rump are rich dark brown that blends to dark chestnut uppertail coverts. Their wing coverts are rich dark brown and their flight feathers slightly paler and more rufescent. Their tail is dark chestnut. Their throat is ochraceous-buff, their breast is streaked with medium brown and ochraceous buff that fades in its lower part, and their belly is brown. Their flanks are a darker and more rufescent brown and their undertail coverts bright rufous. Their iris is brown to dark brown, their maxilla blackish horn to horn-brown, their mandible horn to gray, and their legs and feet olive, greenish brown, or greenish gray.[2]

Distribution and habitat

The Chiriqui foliage-gleaner is found on the Pacific slope from Costa Rica south of the dry northwest into western Panama as far as Veraguas Province. It inhabits tropical evergreen forest, mature secondary forest, and coffee plantations from sea level to 1,400 m (4,600 ft).[7]

Behavior

Movement

The Chiriqui foliage-gleaner is a year-round resident throughout its range.[2]

Feeding

The Chiriqui foliage-gleaner feeds mostly on a variety of insects, spiders, and vertebrates like small lizards. It forages singly or in pairs and often (perhaps usually) joins mixed-species feeding flocks. It forages from the forest's dense undergrowth to its lower mid-storey, acrobatically gleaning and pulling prey from epiphytes, debris, and especially from clumps of dead leaves as it hops along branches and vines. It has also been observed foraging on the ground by flipping aside leaf litter.[2]

Breeding

The Chiriqui foliage-gleaner's breeding season spans from February to May. It is monogamous. It excavates a tunnel up to about 0.75 m (2.5 ft) long in an earthen bank and constructs a shallow cup nest of leaf rachides in a chamber at its end. The clutch size is two or three eggs. The incubation period is 20 to 21 days and fledging occurs about 18 days after hatch. Both parents incubate the clutch and provision the nestlings.[8][9][10][2]

Vocalization

The Chiriqui foliage-gleaner's song is "a loud, harsh rattle lasting 2–5 seconds, repeated 10–30 times per minute". Its call is "a nasal rack or hard tchehrr.[2]

Status

The IUCN follows BirdLife International's taxonomy and so has assessed the pre-split buff-throated foliage gleaner as a whole, with no separate evaluation of the Chiriqui foliage-gleaner.[11] The species is considered common to fairly common and appears to tolerate some forest fragmentation.[2]

References

  1. 1 2 3 Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2023). "Ovenbirds, woodcreepers". IOC World Bird List. v 13.2. Retrieved July 31, 2023.
  2. 1 2 3 4 5 6 7 Remsen, Jr., J. V. and H. F. Greeney (2020). Chiriqui Foliage-gleaner (Automolus exsertus), version 1.0. In Birds of the World (S. M. Billerman, B. K. Keeney, P. G. Rodewald, and T. S. Schulenberg, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.butfog4.01 retrieved September 7, 2023
  3. ↑ Freeman, B.G.; Montgomery, G.A. (2017). "Using song playback experiments to measure species recognition between geographically isolated populations: A comparison with acoustic trait analyses". Auk. 134 (9): 857–870. doi:10.1111/evo.13311. PMID 28722748.
  4. ↑ Chesser, R. T., S. M. Billerman, K. J. Burns, C. Cicero, J. L. Dunn, B. E. Hern ndez-Ba os, R. A. Jim nez, A. W. Kratter, N. A. Mason, P. C. Rasmussen, J. V. Remsen, Jr., and K. Winker. 2023. Check-list of North American Birds (online). American Ornithological Society. https://checklist.americanornithology.org/taxa/
  5. ↑ Clements, J. F., T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2022. The eBird/Clements checklist of birds of the world: v2022. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ retrieved November 10, 2022
  6. ↑ HBW and BirdLife International (2022) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 7. Available at: https://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v7_Dec22.zip retrieved December 13, 2022
  7. ↑ R. Terry Chesser, Kevin J. Burns, Carla Cicero, Jon L. Dunn, Andrew W. Kratter, Irby J. Lovette, Pamela C. Rasmussen, J. V. Remsen, Jr., Douglas F. Stotz, Benjamin M. Winger, and Kevin Winker. "Fifty-ninth supplement to the American Ornithological Society s Check-list of North American Birds". The Auk 2018, vol. 135:798-813 retrieved December 13, 2022
  8. ↑ Skutch, A.F. (1952). Life history of the Chestnut-tailed Automolus. Condor. 54(2): 93-100. 14.
  9. ↑ Skutch, A. F. (1945). Incubation and nesting periods of Central American birds. Auk 62(1):8–37. https://sora.unm.edu/sites/default/files/journals/auk/v062n01/p0008-p0037.pdf 15.
  10. ↑ Skutch, A. F. (1969). Life histories of Central American birds III. Pacific Coast Avifauna 35:1–580.
  11. ↑ BirdLife International (2020). "Buff-throated Foliage-gleaner Automolus ochrolaemus". IUCN Red List of Threatened Species. 2020: e.T22702910A168549497. doi:10.2305/IUCN.UK.2020-3.RLTS.T22702910A168549497.en. Retrieved 6 September 2023.
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