Slaty bristlefront

The slaty bristlefront (Merulaxis ater) is a member of the Neotropical bird family Rhinocryptidae, the tapaculos. It is endemic to south-east Brazil.[3]

Slaty bristlefront
Male
Female
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Passeriformes
Family: Rhinocryptidae
Genus: Merulaxis
Species:
M. ater
Binomial name
Merulaxis ater
Lesson, 1831[2]

Taxonomy and systematics

The slaty bristlefront and Stresemann's bristlefront (Merulaxis stresemanni) form a superspecies, and the two might actually be one species. It has no subspecies.[4][5]

Description

The slaty bristlefront is 18.5 cm (7.3 in) long. A male weighed 37.2 g (1.31 oz) and a female 33 g (1.2 oz). The male is mostly dark blue gray. The lower back is dark brown and the flanks, vent, and tail are black. The female is over all shades of brown, lighter on the throat and breast. Both sexes have a crest of short stiff feathers that stand erect at the base of the bill and forehead.[5]

Distribution and habitat

The slaty bristlefront is found only in southeastern Brazil, in a narrow band near the Atlantic coast from Espírito Santo south to Santa Catarina. It might have formerly occurred further north in southern Bahia.[5]

The slaty bristlefront is a bird of humid forests in both lowlands and mountains. In a few locations it is found at elevations as low as 100 m (330 ft) but more typically its lower limit is 400 m (1,300 ft). In the northern part of its range it is found only in the mountains, as high as 1,800 m (5,900 ft).[5]

Behavior

Feeding

Little is known about the slaty bristlefront's diet. It is known to forage in pairs, though not close together, on the ground and in low vegetation.[5]

Breeding

One slaty bristlefront nest has been described, in Rio de Janeiro state. It was constructed by both members of a pair using twigs, narrow leaves, and leaf stems with a lining of lichen. It was placed in a roughly horizontal burrow at least 1.24 m (4.1 ft) long in an earthen bank.[6]

Vocalization

The slaty bristlefront begins its song with a series of clicks followed by a trill described as "hysterical laughter". It has several calls, described as “tsewk-tsewk, pit”, “keekick”, and “he-he-heeheeheehee”.[5]

Status

The IUCN has assessed the slaty bristlefront as least concern. It is threatened by habitat loss, especially in the lowlands.

References
  1. BirdLife International (2022). "Merulaxis ater". IUCN Red List of Threatened Species. 2022: e.T22703474A210365334. Retrieved 24 July 2022.
  2. "Merulaxis ater Lesson, 1831". Integrated Taxonomic Information System.
  3. Gill, F.; Donsker, D.; Rasmussen, P. (January 2021). "IOC World Bird List (v 11.1)". Retrieved 14 January 2021.
  4. Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 19 January 2021. A classification of the bird species of South America. American Ornithological Society. http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved January 19, 2021
  5. Krabbe, N. and T. S. Schulenberg (2020). Slaty Bristlefront (Merulaxis ater), 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.slabri1.01 retrieved 26 April 2021
  6. Bernardo, Christine S. S.; Thorns, David (2009). "First breeding data for Slaty Bristlefront Merulaxis ater, in Rio de Janeiro, Brazil". Cotinga. 31: 76–77.
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