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Birdwatching in Africa - Thick-billed Raven, Corvus crassirostris


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 most diverse bird order with well over 5,000 identified species, the passerines. The thick-billed raven average 64 cm in length, with a range of 60 to 70 cm and weighs approximately 1.15 kg in females and 1.5 kg in males on average.

Its size is about the same as the largest races 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.

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 in length, is black with a white tip and has deep nasal grooves with only light nasal bristle covers.

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.

Distribution and habitat
Its range covers Eritrea, Somalia and Ethiopia; its habitat includes mountains and high plateau between elevations of 1500 to 3400 metres. It is one of several avian species endemic to northeastern tropical Africa.

Range map from www.oiseaux.net

Range map
Range map from www.oiseaux.net - Ornithological Portal Oiseaux.net
www.oiseaux.net is one of those MUST visit pages if you're in to bird watching. You can find just about everything there


Length:
Wingspan:
Weight: 1.15 kg in females and 1.5 kg in males on average
Longevity:
Distinctive Feature

Similar Species

• An unmistakable Raven

From opus at www.birdforum.net the forum for wild birds and birding.
Female / Male

• Sexes similar. Juveniles with all black bill, duller and more sooty brown than adult.

From opus at www.birdforum.net the forum for wild birds and birding.


Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven feeding on road kill
Ethiopia - November 2019


Behaviour

Diet
The thick-billed raven is omnivorous, feeding on grubs, beetle larvae from animal dung, carrion, scraps of meat and human food. It has been seen taking standing wheat. When seeking food from dung, it has been seen using a distinct scything movement to scatter the dung and extract the grubs.

Nesting
It nests in trees and on cliffs, apparently building a stick nest like the similar and much more widely distributed and studied white-necked raven. It lays three to five eggs. In one case, thick-billed ravens were observed to vigorously displace predatory Verreaux's eagle owls from their nest area.

Voice
Its calls include a harsh nasal croak, a low wheezy croak, a "raven-raven", and sometimes a "dink, dink, dink" sound. Like many Corvids, the thick-billed raven is capable of vocal mimicry; however, this behavior is rare in the wild, and is normally recorded only in captivity.

Listen to the Thick-billed Raven

Remarks from the Recordist

Calls from a bird perched on top of a tall, non-native pine at the edge of an abandoned lot.


www.xeno-canto.org


Conservation status
Conservation status
Least Concern (IUCN 3.1)
IUCN Red List of Threatened Species. IUCN. 2012. Retrieved 26 November 2013.



From Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia

www.birdforum.net


Sighted: 28 October 2019 (Date of first photo that I could use)
Location: Shashamane, Ethiopia


Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 28 October 2019 - Shashamane, Ethiopia

Thick-billed Raven, Corvus crassirostris
Thick-billed Raven - 7 November 2019 - Along road B90 1km East of Dodola, Ethiopia



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