Back Dikbekraaf Afrikaans ባለ ወፍራም እንቁር ቁራ Amharic غراب سميك المنقار Arabic غراب سميك المنقار ARZ Corvus crassirostris AST Дебелоклюна врана Bulgarian Corb becample Catalan Corvus crassirostris CEB Krkavec tlustozobý Czech Cigfran bigbraff Welsh

Thick-billed raven

Thick-billed raven
In Ethiopia
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Corvidae
Genus: Corvus
Species:
C. crassirostris
Binomial name
Corvus crassirostris
Rüppell, 1836

The thick-billed raven (Corvus crassirostris), a corvid from the Horn of Africa, shares with the common raven the distinction of being the largest bird in the corvid family, and indeed the largest of the passerines. The thick-billed raven averages 64 cm (25 in) in length, with a range of 60 to 70 cm (24 to 28 in) and weighs approximately 1.15 kg (2.5 lb) in females and 1.5 kg (3.3 lb) in males on average. Its size is about the same as the largest subspecies of common raven (i.e. those from the Himalayas and Greenland/Canadian Northwest Atlantic) but some common raven subspecies are rather smaller and, going on average weights, the thick-billed raven is likely the heaviest extant passerine. The thick-billed raven is about 25% heavier on average than the Australasian superb lyrebird, which is sometimes erroneously titled the largest passerine.[2][3][4][5]

It has a very large bill that is laterally compressed and is deeply curved in profile giving the bird a very distinctive appearance. This bill, the largest of any passerine at 8–9 cm (3.1–3.5 in) in length, is black with a white tip and has deep nasal grooves with only light nasal bristle covers.[6] This raven has very short feathers on the head, throat and neck. The throat and upper breast have an oily brown gloss, while the rest of the bird is glossy black except for a distinctive white patch of feathers on the nape and onto the neck.

  1. ^ BirdLife International (2016). "Corvus crassirostris". IUCN Red List of Threatened Species. 2016: e.T22706081A94049830. doi:10.2305/IUCN.UK.2016-3.RLTS.T22706081A94049830.en. Retrieved 12 November 2021.
  2. ^ Madge, S. (2010). Crows and jays. A&C Black.
  3. ^ Brehm, A.E. (1900). Tierleben, Die Vogels.
  4. ^ Dunning, John B. Jr., ed. (2008). CRC Handbook of Avian Body Masses (2nd ed.). CRC Press. ISBN 978-1-4200-6444-5.
  5. ^ Clench, M. H., & Mathias, J. R. (1995). The avian cecum: a review. The Wilson Bulletin, 93-121.
  6. ^ Laiolo, P., & Rolando, A. (2003). Comparative analysis of the rattle calls in Corvus and Nucifraga: the effect of body size, bill size, and phylogeny. The Condor, 105(1), 139-144.

Rich TVX News Network Site

Rich TVX News Network Info

© MMXXIII Rich X Search. We shall prevail. All rights reserved. Rich X Search