Hook-billed hermit

The hook-billed hermit (Glaucis dohrnii) is a threatened species of hummingbird in the family Trochilidae. It is endemic to a small area of Brazil.[3][1]

Hook-billed hermit
CITES Appendix I (CITES)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Clade: Strisores
Order: Apodiformes
Family: Trochilidae
Genus: Glaucis
Species:
G. dohrnii
Binomial name
Glaucis dohrnii
(Bourcier & Mulsant, 1852)
Synonyms

Ramphodon dohrnii (Bourcier & Mulsant, 1852)

Taxonomy and systematics

The hook-billed hermit was for a time placed in genus Ramphodon, but morphological characteristics place it firmly in Glaucis. It is monotypic.[4][5][3]

Description

The hook-billed hermit is 12 to 13 cm (4.7 to 5.1 in) long. Males weigh 6 to 9 g (0.21 to 0.32 oz) and females 5.5 to 7 g (0.19 to 0.25 oz). Its upperparts are greenish bronze and the underparts cinnamon. The face has a white supercilium and "moustache" and is otherwise dusky. The tail is metallic bronze with white-tipped outer feathers. Its bill is nearly straight. The sexes have essentially the same plumage though the female's underparts are somewhat paler than the male's.[5]

Distribution and habitat

The hook-billed hermit is found only at a few sites in the southeastern Brazilian states of Bahia and Espírito Santo in Neotropical realm forest climates. It probably formerly occurred in Minas Gerais and possibly Rio de Janeiro states, though in the latter it is known only from trade skins that might have originated elsewhere. It inhabits the understory of inland primary and littoral forests, usually along streams. It favors areas with abundant Heliconia plants. In elevation it ranges from sea level to 500 m (1,600 ft).[5]

Behavior

Movement

The hook-billed hermit is thought to be sedentary or a non migration period lifestyle. However, the few records from any one site make that determination difficult.[5]

Feeding

Like other hermit hummingbirds, the hook-billed hermit is a "trap-line" feeder, visiting a circuit of flowering plants. It feeds on nectar at Heliconia and other plants and also on small arthropods, but details are lacking.[5]

Breeding

The hook-billed hermit's breeding season is believed to span from September to February. The nest is made from plant material and cobwebs under the tip of a long drooping leaf. Its clutch is two eggs.[5]

Vocalization

The hook-billed hermit's song is described as similar to those of the rufous-breasted hermit (G. hirsutus), a "rapid 'seep-seep-seep'", and the saw-billed hermit (Ramphodon naevius), "a descending series...of 'seee' notes."[5][6][7]

Status

The IUCN originally assessed the hook-billed hermit in 1988 as Threatened, then in 1994 as Critically Endangered, then in 2000 as Endangered, and in 2021 as Vulnerable. Its small range has undergone massive deforestation and what remains is fragmented. Its population is estimated at under 10,000 mature individuals and is believed to be decreasing.[1] It may now only occur only in a few reserves and national parks in Bahia and one in Espírito Santo.[5]

References
  1. BirdLife International (2021). "Hook-billed Hermit Glaucis dohrnii". IUCN Red List of Threatened Species. 2021: e.T22687026A137470206. doi:10.2305/IUCN.UK.2021-3.RLTS.T22687026A137470206.en. Retrieved 1 January 2022.
  2. "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. Gill, F.; Donsker, D.; Rasmussen, P. (July 2021). "IOC World Bird List (v 11.2)". Retrieved July 14, 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 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
  5. Hinkelmann, C. and G. M. Kirwan (2020). Hook-billed Hermit (Glaucis dohrnii), 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.hobher2.01 retrieved November 14, 2021
  6. van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. p. 158. ISBN 978-0-19-530155-7.
  7. Hinkelmann, C. and G. M. Kirwan (2020). Saw-billed Hermit (Ramphodon naevius), 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 retrieved November 13, 2021
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