Northern crested caracara

Northern caracara
Northern caracara at Brevard Zoo, Florida
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Falconiformes
Family: Falconidae
Subfamily: Polyborinae
Genus: Caracara
Species: C. cheriway
Binomial name
Caracara cheriway
(Jacquin, 1784)
Map showing the range of Caracara cheriway
Range of C. cheriway
Synonyms

Polyborus cheriway
Polyborus plancus
Polyborus plancus cheriway
Caracara plancus cheriway
Polyborus plancus audubonii
Polyborus tharus[2]

The northern crested caracara (Caracara cheriway), also called the northern caracara and crested caracara,[3] is a bird of prey in the family Falconidae. It was formerly considered conspecific with the southern caracara (C. plancus) and the extinct Guadalupe caracara (C. lutosa) as the "crested caracara". It has also been known as the Audubon's caracara. As with its relatives, the northern caracara was formerly placed in the genus Polyborus. Unlike the Falco falcons in the same family, the caracaras are not fast-flying aerial hunters, but are rather sluggish and often scavengers.

Distribution

The northern caracara is a resident in Cuba, northern South America (south to northern Peru and northern Amazonian Brazil) and most of Central America and Mexico, just reaching the southernmost parts of the United States, including Florida, where it is resident but listed as threatened. There have been reports of the crested caracara as far north as San Francisco, California.[4] and, in 2012, near Crescent City, California.[5] South of the US border, it is generally common. It can also be found (nesting) in the Southern Caribbean (e.g. Aruba, Curaçao and Bonaire). This is a bird of open and semi-open country.

Description

The mottled breast and pinkish-purple facial skin and cere are typical of immatures
Young adult perched on a cactus, Bonaire, BES Islands

The northern caracara has a length of 49–58 cm (19–23 in), a wingspan of 107–130 cm (42–51 in), and weighs 800–1,355 g (1.764–2.987 lb).[6] Average weight is higher in the north of the range, smaller in the tropics. In Florida, 21 male birds averaged 1,117 g (2.463 lb) and 18 female birds averaged 1,200 g (2.6 lb). In Panama, males were found to average 834 g (1.839 lb) and females averaged 953 g (2.101 lb).[7] Among caracaras, it is second in size only to the southern caracara.[8] Broad-winged and long-tailed, it also has long legs and frequently walks and runs on the ground. It is very cross-shaped in flight. The adult has a black body, wings, crest and crown. The neck, rump, and conspicuous wing patches are white, and the tail is white with black barring and a broad terminal band. The breast is white, finely barred with black. The bill is thick, grey and hooked, and the legs are yellow. The cere and facial skin are deep yellow to orange-red depending on age and mood. Sexes are similar, but immature birds are browner, have a buff neck and throat, a pale breast streaked/mottled with brown, greyish-white legs and greyish or dull pinkish-purple facial skin and cere. The voice of this species is a low rattle.

Adults can be separated from the similar southern caracara by their less extensive and more spotty barring to the chest, more uniform blackish scapulars (brownish and often lightly mottled/barred in the southern), and blackish lower back (pale with dark barring in the southern). Individuals showing intermediate features are known from the small area of contact in north-central Brazil, but intergradation between the two species is generally limited.

Habitat

Northern caracaras inhabit various types of open and semi-open country. They typically live in lowlands but can live to mid-elevation in the Northern Andes. The species is most common in cattle ranches with scattered trees, shelterbelts and small woods, as long as there is a somewhat limited human presence. They can also be found in other varieties of agricultural land, as well as prairies, coastal woodlands (including mangroves), coconuts plantations, scrub along beach dunes and open uplands.

Behavior

Northern caracaras fighting. Painted by John James Audubon.

The northern caracara is an carnivorous scavenger that mainly feeds on carrion. The live prey they do catch is usually immobile, injured, incapacitated or young. Prey species can include small mammals, amphibians, reptiles, fish, crabs, insects, their larvae, earthworms, shellfish and young birds. Bird species that are culled can range from large, colonial nesting birds such as storks and herons to small passerines. Reptiles taken often including snakes, lizards and small freshwater turtles. This species, along with other caracaras, is one of few raptors that hunts on foot, often turning over branches and cow dung to reach food. In addition to hunting its own food on the ground, the northern caracara will steal from other birds, including vultures, Buteos, pelicans, ibises and spoonbills. Because they stay low to the ground even when flying, they often beat Cathartes vultures to carrion and can aggressively displace single vultures of most species from small carcasses. They will occasionally follow trains or automobiles to fetch food that falls off.[8]

Northern caracaras can usually be spotted either alone, in pairs or family parties of 3–5 birds. Occasionally roosts may contain more than a dozen caracaras and abundant food sources can cause more than 75 to gather. The nesting season is from December to May and is a bit earlier the closer the birds live to the tropics. They build large stick nests in trees such as mesquites and palms, cacti, or on the ground as a last resort.[9] The nests are bulky and untidy, 60–100 cm (24–39 in) wide and 15–40 cm (5.9–15.7 in) deep, often made of grasses, sticks and hay, spotted with much animal matter.[8] It lays 2 to 3 (rarely 1 to 4) pinkish-brown eggs with darker blotches, which are incubated for 28–32 days.[10]

Taxonomy

C. prelutosus fossil

Though the northern caracaras of our time are not divided into subspecies as their variation is clinal, prehistoric subspecies are known. Due to the confused taxonomic history of the crested caracaras, their relationships to the modern birds are in need of restudy:

The former almost certainly represents birds which were the direct ancestors of the living population. The latter may actually be the ancestor of the Guadalupe caracara.

Florida caracara

The state of Florida is home to a relict population of northern caracaras that dates to the last glacial period, which ended around 12,500 BP. At that point in time, Florida and the rest of the Gulf Coast was covered in an oak savanna. As temperatures increased, the savanna between Florida and Texas disappeared.[11] Caracaras were able to survive in the prairies of central Florida as well as in the marshes along the St. Johns River. Cabbage palmettos are a preferred nesting site, although they will also nest in southern live oaks.[12] Their historical range on the modern-day Florida peninsula included Okeechobee, Osceola, Highlands, Glades, Polk, Indian River, St. Lucie, Hardee, DeSoto, Brevard, Collier, and Martin counties.[13] They are currently most common in DeSoto, Glades, Hendry, Highlands, Okeechobee and Osceola counties.[14] Loss of adequate habitat caused the Florida caracara population to decline, and it was listed as threatened by the United States Fish and Wildlife Service in 1987.[13]

Northern caracara in Mexico

An immature bird surveying the surroundings in Texas, USA

The Mexican ornithologist Rafael Martín del Campo proposed that the northern caracara was probably the sacred "eagle" depicted in several pre-Columbian Aztec codices as well as the Florentine Codex. This imagery was adopted as a national symbol of Mexico, and is seen on the flag among other places. Since the paintings were interpreted as showing the golden eagle, it became the national bird.[15]

References

  1. ↑ BirdLife International (2012). "Caracara cheriway". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ Dove, Carla J.; Banks, Richard C. (1999). "A Taxonomic Study of Crested Caracaras (Falconidae)" (PDF). The Wilson Bulletin 111 (3): 330–339.
  3. ↑ "Common Names for Crested Caracara (Caracara cheriway)". Encyclopedia of Life. Retrieved 10 January 2014.
  4. ↑ "Rare Raptors". Golden Gate Raptor Observatory. Retrieved 22 August 2009.
  5. ↑ "caracara sighting record". Project Noah. 13 February 2012.
  6. ↑ "Crested Caracara". All About Birds. Cornell Lab of Ornithology. Retrieved 2009-08-22.
  7. ↑ CRC Handbook of Avian Body Masses, 2nd Edition by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.
  8. 1 2 3 Ferguson-Lees, James; Christie, David A. (2001). Raptors of the World. Houghton Mifflin Harcourt. ISBN 0-618-12762-3.
  9. ↑ "Northern Caracara". Salt Grass Flats. Retrieved 22 January 2009.
  10. ↑ "Crested Caracara (Polyborus plancus)". Explore Birds of Prey. The Peregrine Fund. Retrieved 20 August 2009.
  11. ↑ "Chapter VIII. Florida Relict Species". Resource Guide. Indian River Lagoon Envirothon. Retrieved 23 January 2009.
  12. ↑ "Audubon’s Crested Caracara" (PDF). South Florida Ecological Services Office. United States Fish and Wildlife Service. Retrieved 23 January 2009.
  13. 1 2 Morrison, J.L. (October 2004). "The Crested Caracara in the changing grasslands of Florida" (PDF). In Noss, R. Land of Fire and Water: The Florida Dry Prairie Ecosystem. Proceedings of the Florida Dry Prairie Conference, October 2004. Sebring, Florida. pp. 211–215.
  14. ↑ "Species Profile: Crested Caracara". Florida Fish and Wildlife Conservation Commission. Retrieved 10 August 2014.
  15. ↑ González Block, Miguel A. (2004). "El Iztaccuahtli y el Águila Mexicana: ¿Cuauhtli o Águila Real?". Arqueología Mexicana (in Spanish) XII (70): 60–65.

External links

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