Chestnut-headed nunlet

The chestnut-headed nunlet (Nonnula amaurocephala) is a species of near-passerine bird in the family Bucconidae, the puffbirds, nunlets, and nunbirds. It is endemic to Brazil.[2]

Chestnut-headed nunlet
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Piciformes
Genus: Nonnula
Species:
N. amaurocephala
Binomial name
Nonnula amaurocephala
Chapman, 1921

Taxonomy and systematics

The chestnut-headed nunlet is monotypic. It, the rufous-capped nunlet (N. ruficapilla), and the grey-cheeked nunlet (N. frontalis) form a superspecies.[3][4]

Description

The chestnut-headed nunlet is 14 to 15 cm (5.5 to 5.9 in) long and weighs 15 to 16 g (0.53 to 0.56 oz). Its entire head, upper mantle, breast, and upper belly are bright rufous. Its back, wings, and tail are plain dull brown; the rump has an olive wash. The rufous upper belly grades to whitish on the lower belly. The bill is mostly black, the eye red, and the feet lead gray.[4]

Distribution and habitat

The chestnut-headed nunlet is found only in a small part of Brazil's Amazonas state, north of the Amazon River and west of the Negro River. It almost exclusively inhabits the understory of seasonally flooded igapó forest, usually up to about 3 m (10 ft) above the ground but sometimes as high as 8 m (26 ft).[4]

Behavior

Feeding

The chestnut-headed nunlet has been observed sallying from a perch, presumably to catch invertebrate prey, but no details of its feeding behavior or diet have been published.[4]

Breeding

No details of the chestnut-headed nunlet's breeding phenology have been published.[4]

Vocalization

No recordings or description of the chestnut-headed nunlet's vocalizations are available as of late 2021.

Status

The IUCN originally assessed the chestnut-headed nunlet in 1988 as Near Threatened but since 2004 has rated it as being of Least Concern. It has a very small range and unquantified population that is believed to be decreasing.[1] Its igapó habitat is widespread and under little human pressure, and the species is probably undercounted due to its quiet and sedentary nature.[4]

References
  1. BirdLife International (2016). "Chestnut-headed Nunlet Nonnula amaurocephala". IUCN Red List of Threatened Species. 2016. Retrieved 11 November 2021.
  2. Gill, F.; Donsker, D.; Rasmussen, P. (July 2021). "IOC World Bird List (v 11.2)". Retrieved July 14, 2021.
  3. 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 24 August 2021. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved August 24, 2021
  4. Rasmussen, P. C. and N. Collar (2020). Chestnut-headed Nunlet (Nonnula amaurocephala), 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.chhnun1.01 retrieved November 11, 2021
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