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Lifespan, longevity, and ageing

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Maximum longevity: 14 years (wild)
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Dusky grouse

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The dusky grouse (Dendragapus obscurus) is a species of forest-dwelling grouse native to the Rocky Mountains in North America.[2][3] It is closely related to the sooty grouse (Dendragapus fuliginosus), and the two were previously considered a single species, the blue grouse.[2][3][4]

Description

Adults have a long square tail, gray at the end. Adult males are mainly dark with a purplish throat air sac surrounded by white, and a yellow to red wattle over the eye during display. Adult females are mottled brown with dark brown and white marks on the underparts.[3]

Distribution and habitat

Their breeding habitat is the edges of conifer and mixed forests in mountainous regions of western North America, from southeastern Alaska and Yukon south to New Mexico.[3] Their range is closely associated with that of various conifers. Their nest is a scrape on the ground concealed under a shrub or log.

Migration

They are permanent residents but move short distances by foot and short flights to denser forest areas in winter, with the odd habit of moving to higher altitudes in winter.[2]

Diet

These birds forage on the ground, or in trees in winter. In winter, they mainly eat fir and douglas-fir needles, occasionally also hemlock and pine needles; in summer, other green plants (Pteridium, Salix), berries (Gaultheria, Mahonia, Rubus, Vaccinium), and insects (particularly ants, beetles, grasshoppers) are more important. Chicks are almost entirely dependent on insect food for their first ten days.[2]

Breeding

Males sing with deep hoots on their territory and make short flapping flights to attract females. Females leave the male's territory after mating.

References

  1. ^ BirdLife International (2016). "Dendragapus obscurus". IUCN Red List of Threatened Species. 2016: e.T22734690A95095102. doi:10.2305/IUCN.UK.2016-3.RLTS.T22734690A95095102.en. Retrieved 12 November 2021.
  2. ^ a b c d del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1994). Handbook of the Birds of the World 2: 401-402. Lynx Edicions, Barcelona ISBN 84-87334-15-6.
  3. ^ a b c d Sibley, D. (2000). The Sibley Guide to Birds. Knopf. p. 143. ISBN 0-679-45122-6.
  4. ^ Banks, R. C.; Cicero, C.; Dunn, J. L.; Kratter, A. W.; Rasmussen, P. C.; Remsen, J. V. Jr.; Rising, J. D.; Stotz, D. F. (2006). "Forty-seventh Supplement to the American Ornithologists' Union Check-list of North American Birds" (PDF). The Auk. 123 (3): 926–936. doi:10.1642/0004-8038(2006)123[926:FSTTAO]2.0.CO;2. Retrieved 2007-09-16.

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Dusky grouse: Brief Summary

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The dusky grouse (Dendragapus obscurus) is a species of forest-dwelling grouse native to the Rocky Mountains in North America. It is closely related to the sooty grouse (Dendragapus fuliginosus), and the two were previously considered a single species, the blue grouse.

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Tétras sombre

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Dendragapus obscurus

Le Tétras sombre (Dendragapus obscurus (Say, 1823)) est une espèce d'oiseau qui appartenait à l'ancienne famille des Tetraonidae, et qui est désormais incluse dans celle des Phasianidae.

Liste des sous espèces

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    Carte de répartition
    Dendragapus obscurus obscurus (Say, 1823)
  • Dendragapus obscurus richardsonii (Douglas, 1829)
  • Dendragapus obscurus pallidus Swarth, 1931
  • Dendragapus obscurus oreinus Behle & Selander, 1951

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Tétras sombre: Brief Summary

provided by wikipedia FR

Dendragapus obscurus

Le Tétras sombre (Dendragapus obscurus (Say, 1823)) est une espèce d'oiseau qui appartenait à l'ancienne famille des Tetraonidae, et qui est désormais incluse dans celle des Phasianidae.

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