Short-toed snake eagle

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Short-toed snake eagle
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Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Accipitridae
Genus: Circaetus
Species:
C. gallicus
Binomial name
Circaetus gallicus
(Gmelin, 1788)
Subspecies [2]
  • C. g. gallicus - (Gmelin, JF, 1788)
  • C. g. sacerdotis - Ng, N, Christidis, Olsen, Norman & Rheindt, 2017
CircaeutusGallicusIUCN2019-2.png
Range of C. gallicus
  Breeding
  Resident
  Passage
  Non-breeding

The short-toed snake eagle (Circaetus gallicus), also known as the short-toed eagle, is a medium-sized bird of prey in the family Accipitridae, which also includes many other diurnal raptors such as kites, buzzards and harriers. The genus name Circaetus is from the Ancient Greek kirkos, a type of hawk, and aetos, "eagle". The specific gallicus means "of Gaul". [3]

Contents

Range and habitat

This is an Old World species found throughout the Mediterranean basin, into Russia and the Middle East, and parts of Western Asia, and in the Indian Subcontinent and also further east in some Indonesian islands.

Those present on the northern edge of the Mediterranean and other parts of Europe migrate mainly to sub-Saharan Africa north of the equator, leaving in September/October and returning in April/May. [4] In the Middle and Far East the populations are resident. In Europe, it is most numerous in Spain where it is fairly common but elsewhere it is rare in many parts of its range. A bird on the Isles of Scilly, Britain, in October 1999 was the first confirmed record for that country.

The short-toed snake eagle is found in open cultivated plains, arid stony deciduous scrub areas and foothills and semi-desert areas. [5] It requires trees for nesting and open habitats, such as cultivations and grasslands for foraging. [6]

Description

These are relatively large snake eagles. Adults are 59 to 70 cm (23 to 28 in) long with a 162 to 195 cm (5 ft 4 in to 6 ft 5 in) wingspan and weigh 1.2–2.3 kg (2.6–5.1 lb), an average weight for the species is about 1.7 kg (3.7 lb). [7] [8] [9] They can be recognised in the field by their predominantly white underside, the upper parts being greyish brown. The chin, throat and upper breast are a pale, earthy brown. The tail has 3 or 4 bars. Additional indications are an owl-like rounded head, brightly yellow eyes and lightly barred under wing.

The short-toed snake eagle spends more time on the wing than do most members of its genus. It favours soaring over hill slopes and hilltops on updraughts, and it does much of its hunting from this position at heights of up to 500 m (1,600 ft). When quartering open country it frequently hovers like a kestrel. [10] When it soars it does so on flattish wings.

Behaviour

Its prey is mostly reptiles, mainly snakes, but also some lizards. [11] Sometimes they become entangled with larger snakes and battle on the ground. [12] Occasionally, they prey on small mammals up to the size of a rabbit, and rarely birds and large insects.

This eagle is generally very silent. On occasions, it emits a variety of musical whistling notes. When breeding, it lays only one egg. It can live up to 17 years.

The short-toed snake eagle has suffered a steep decline in numbers and range in Europe and is now rare and still decreasing in several countries due to changes in agriculture and land use. It needs protection.[ citation needed ] In the middle and far eastern part of its range, this species is not yet threatened.

Historical material

In his description of the species, Buffon says that he kept one of these eagles in captivity and observed its behavior. The captive bird ate mice and frogs, and he states that the Jean-de-blanc was well known by French farmers for raiding poultry. [13]

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<i>Circaetus</i>

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Lesser fish eagle

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Black-chested snake eagle

The black-chested snake eagle or black-breasted snake eagle is a large African bird of prey of the family Accipitridae. It resembles other snake eagles and was formerly considered conspecific with the short-toed and Beaudouin's snake eagles, to which it is closely related.

Collared sparrowhawk

The collared sparrowhawk is a small, slim bird of prey in the family Accipitridae found in Australia, New Guinea and nearby smaller islands. As its name implies the collared sparrowhawk is a specialist in hunting small birds. It is characterised by its slight brow ridges and slender feet. The last segment of their middle toe projects beyond the claws of the other toes.

Brown snake eagle

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Congo serpent eagle

The Congo serpent eagle is a species of bird of prey in the family Accipitridae, and is sometimes placed in the monotypic genus Dryotriorchis by some taxonomic authorities. This species is distributed across the African tropical rainforest, including upper and lower Guinean forests. This serpent eagle specializes in hunting in these forests’ dark understories. It has two subspecies, the nominate subspecies Dryotriorchis spectabilis spectabilis and Dryotriorchis spectabilis batesi. Though monotypic, it appears to be very closely related to Circaetus. This hawk is a medium-sized bird with distinctive short, rounded wings and a long, rounded tail. It is varying shades of brown on its back and has a slight crest. Its breast is white with variable amounts of a rufous wash and, in the nominate subspecies, is covered in round, blackish spots. The subspecies D. s. batesi only has these dots on its flanks. The Congo serpent eagle closely resembles Cassin's hawk-eagle, and some ornithologists believe that this likeness is a rare example of avian mimicry. It is a very vocal raptor, and often is one of the most heard species in its habitat.

Beaudouins snake eagle

Beaudouin's snake eagle is a species of snake eagle in the family Accipitridae found in the Sahel region of west Africa. It forms a superspecies with the Palearctic short-toed snake eagle Circaetus gallicus and the black-chested snake eagle Circaetus pectoralis. This bird seems to be declining in numbers and the International Union for Conservation of Nature has rated it as a "vulnerable species".

References

  1. BirdLife International (2013). "Circaetus gallicus". IUCN Red List of Threatened Species . 2013. Retrieved 26 November 2013.CS1 maint: ref=harv (link)
  2. Gill F, D Donsker & P Rasmussen (Eds). 2020. IOC World Bird List (v10.2). doi : 10.14344/IOC.ML.10.2.
  3. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp.  108, 170. ISBN   978-1-4081-2501-4.
  4. Bakaloudis, D.E.; C. Vlachos; G. Holloway (2005). "Nest spacing and breeding performance in Short-toed Eagle Circaetus gallicus in northeast Greece". Bird Study. 52 (3): 330–338. doi: 10.1080/00063650509461407 .
  5. Bakaloudis, D.E.; C. Vlachos; G.J. Holloway (1998). "Habitat use by short-toed eagles Circaetus gallicus and their reptilian prey during the breeding season in Dadia Forest (north-eastern Greece)". Journal of Applied Ecology. 35 (6): 821–828. doi: 10.1111/j.1365-2664.1998.tb00001.x .
  6. Bakaloudis, D.E. (2009). "Implications for conservation of foraging sites selected by Short-toed Eagles (Circaetus gallicus) in Greece". Ornis Fennica. 86: 89–96.
  7. del Hoyo, J.; Elliott, A.; Sargatal, J., eds. (1994). Handbook of the Birds of the World . Volume 2: New World Vultures to Guineafowl. Barcelona: Lynx Edicions.
  8. Borrow, N. (2020). Field Guide to Birds of Western Africa. Bloomsbury Publishing.
  9. Klem, D. (1997). A field guide to birds of Armenia. American University of Armenia.
  10. Bakaloudis, D.E. (2010). "Hunting strategies and foraging performance of the short-toed eagle in the Dadia-Lefkimi-Soufli National Park, north-east Greece". Journal of Zoology. 281: 168–174. doi:10.1111/j.1469-7998.2010.00691.x.
  11. Bakaloudis D.E.; C.G. Vlachos (2011). "Feeding habits and provisioning rate of breeding short-toed eagles Circaetus gallicus in northeastern Greece". Journal of Biological Research. 16: 166–176.
  12. Jerdon, T.C. (1862). The Birds of India. Volume 1. Military Orphan Press. p. 77.
  13. "The White John". The natural history of birds from the French of the Count de Buffon. vol. 1. Translated by Anonymous. London. 1793. pp. 86–95.