Aplomado falcon

The aplomado falcon (Falco femoralis) is a medium-sized falcon of the Americas. The species' largest contiguous range is in South America, but not in the deep interior Amazon Basin. It was long known as Falco fusco-coerulescens or Falco fuscocaerulescens, but these names are now believed to refer to the bat falcon (F. rufigularis).[2] Its resemblance in shape to the hobbies accounts for its old name orange-chested hobby. Aplomado is an unusual Spanish word for "lead-colored", referring to the blue-grey areas of the plumage – an approximate English translation would be "plumbeous falcon". Spanish names for the species include halcón aplomado and halcón fajado (roughly "banded falcon" in reference to the characteristic pattern); in Brazil it is known as falcão-de-coleira.

Aplomado falcon
Aplomado Falcon portrait
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Falconiformes
Family: Falconidae
Genus: Falco
F. femoralis
Binomial name
Falco femoralis
Temminck, 1822

See text


Falco femoralis-PacificRR-AA
Illustration from Pacific Railroad Surveys

The aplomado falcon is very slender, long-winged, and long-tailed, the size of a small peregrine falcon (F. peregrinus), at 12–16 in (30–40 cm) long and with an average wingspan of about 36 in (90 cm), but only half the weight, at about 7.3–10.8 oz (208–305 g) in males and 9.6–16 oz (271–460 g) in females.[3] In adult birds, the upperparts are dark blue-grey, as is much of the head, with the usual falcon "moustache" contrasting sharply with the white throat and eyestripe. The upper breast continues the white of the throat; there are black patches on each side of the lower breast that meet in the middle; the belly and thighs, below the black patches, are light cinnamon. The tail is black with narrow white or grey bars and a white tip. The cere, eye-ring, and feet are yellow or yellow-orange.[4]

Except that females are bigger than males, the sexes are similar. Juvenile birds are very similar to adults, but their upperparts and belly band are blackish brown, the chest is streaked with black, the white on the head and breast is buffy, and the cinnamon on the underparts is paler, as are the feet.[4]

This species may be confused with the bat falcon (F. rufigularis) and the orange-breasted falcon (F. deiroleucus), which have similar white-black-rust patterns below, but those species are built more like peregrine falcons and have solidly blackish heads and darker rufous bellies.[4] These two species are generally considered to belong to the same lineage as the aplomado falcon. Two other Falco species of the Americas, merlin (F. columbarius) and American kestrel (F. sparverius), seem to be closer to the Aplomado group than most other falcons, but the relationships of all these lineages are fairly enigmatic. All that can be said with some certainty is that they diverged as part of an apparently largely western Holarctic radiation in the Late Miocene, probably around 8 to 5 million years ago.[5][6][7][8][9]

Range, ecology and status

The aplomado falcon's habitat is dry grasslands, savannahs, and marshes. It ranges from northern Mexico and Trinidad locally to southern South America, but has been extirpated from many places in its range, including all of northern and central Mexico except for a small area of Chihuahua. Globally, however, it is so widespread that it is assessed as Species of Least Concern by the IUCN.[1]

It feeds on large invertebrates and small vertebrates, with small birds making up the overwhelming bulk of its prey. Mixed-species feeding flocks in open cerrado and grassland will go on frenzied alert upon spotting this species; small birds fear it more than most other predators.[10] It is often seen soaring at twilight hunting insects and eating them on the wing.[4] It also hunts at fields being burned, at which many birds of this species may gather; cooperation between individual aplomado falcons – usually members of a pair – has also been recorded. In Brazil, aplomado falcons have been observed following maned wolves (Chrysocyon brachyurus) and chasing birds that the wolves flush.[11] Prey items typically weigh one-fifth to one-half of the falcons' own weight, but females of this species (which due to their size can tackle larger prey) have been recorded eating birds larger than themselves, such as a cattle egret (Bulbucus ibis) or a plain chachalaca (Ortalis vetula), on rare occasions.[3]

Aplomado falcon at the THA Meet '09

The nest is a platform built of sticks at any height in a bush or tree. Two or three eggs are laid.[4]

Until the 1950s it was found in the extreme southwestern United States, and reintroduction efforts are under way in West and South Texas. It began to reoccupy its former range in West Texas and southern New Mexico in the 1990s.[12] Documentary evidence for these naturally occurring birds was obtained in New Mexico in 1991, and sightings built steadily through that decade and the next, leading to successful fledging of three young in 2002.[13] Sightings and nesting activity continue to the present. The addition of nesting platforms to areas where Northern Aplomado Falcons Falco femoralis septentrionalis were reintroduced in South Texas improved the birds' productivity. This resulted in a stable population, however without the addition of nest platforms the re-introduced population would likely decline to extinction.[14]

The expansion of the reintroduction program to that area has met with criticism,[15] because technically, all aplomado falcons in New Mexico are classified as part of the "experimental" (reintroduction) population.[16] As such, while they are still legally protected from hunting, they are not protected by Endangered Species Act requirements to preserve habitat and the like. It is believed that mainly habitat destruction caused the species' (near-)disappearance from the US and hinders reestablishment of a wild breeding population. A coalition of environmental groups is attempting to have full protection restored so as not to jeopardize the success of the expanding wild population and the reintroduction efforts.[17] A published paper [18] describes the mixed success of the reintroduction program, carried out by The Peregrine Fund. Reintroduced birds are now breeding on the Texas coast. But in the Chihuahuan Desert locations of west Texas and southern New Mexico, the birds were never successful for an extended period of time, and The Peregrine Fund has now abandoned the reintroduction program.


Similar to the merlin, the aplomado falcon will chase after game such as small birds and quail, by pursuit flight, which is flying after quarry flushed out. It is mainly acquired from breeders because of its scarcity in the United States, and many falconers in Europe will buy a pair for about £4000. It's admired for its accipiter-like hunting style, which has made the bird famous for being more like an accipiter than a falcon. This is also shown through its determination to catch the quarry even going into heavy cover. They are ideal for quail, doves, and will sometimes even go after squirrel or rabbits. Unfortunately, these birds are also known for carrying their game, like many small falcons, where they try fly away from the falconer with their catch. The range of quarry vary from sparrows to adult pheasants. One of the most difficult quarry for the aplomado is the partridge because of its strength, speed and flight distance.

Articles on hunting with aplomado falcons as well as basic research on this species can be found at www.aplomadofalcons.com

American falconer Jim Nelson has written, "During the time of Shakespeare a new bird from the New World came upon the falconry scene in Spain, Portugal and France. It was known to courtiers of Henry IV and Louis XIII as the Alethe... prized as "high mettled" partridge hawks...french falconer Charles d'Arcussia is the only writer who actually saw game taken with trained Alethes." Nelson concluded that the true identity of the Old World Alethe is the modern day aplomado falcon.[19]


  1. ^ a b BirdLife International (2012). "Falco femoralis". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ^ American Ornithologists' Union (1948). "Twenty-third supplement to the American Ornithologists' Union check-list of North American birds" (PDF). The Auk. 65 (3): 438–443. doi:10.2307/4080493. JSTOR 4080493.
  3. ^ a b Granzinolli, Marco Antonio M.; Motta-Junior, José Carlos (2006). "Predation on the Cattle Egret (Bubulcus ibis) and consumption of the Campo Flicker (Colaptes campestris) by the aplomado falcon (Falco femoralis) in Brazil". Revista Brasileira de Ornitologia. 14 (4): 453–454.
  4. ^ a b c d e Howell, Steven N. G. & Webb, Sophie (1995): A Guide to the Birds of Mexico and Northern Central America. Oxford University Press, Oxford & New York. ISBN 0-19-854012-4
  5. ^ Griffiths, Carole S. (1999). "Phylogeny of the Falconidae inferred from molecular and morphological data" (PDF). The Auk. 116 (1): 116–130. doi:10.2307/4089459. JSTOR 4089459.
  6. ^ Griffiths, Carole S.; Barrowclough, George F.; Groth, Jeff G.; Mertz, Lisa (2004). "Phylogeny of the Falconidae (Aves): a comparison of the efficacy of morphological, mitochondrial, and nuclear data". Molecular Phylogenetics and Evolution. 32 (1): 101–109. doi:10.1016/j.ympev.2003.11.019. PMID 15186800.
  7. ^ Groombridge, Jim J.; Jones, Carl G.; Bayes, Michelle K.; van Zyl, Anthony J.; Carrillo, José; Nichols, Richard A.; Bruford, Michael W. (2002). "A molecular phylogeny of African kestrels with reference to divergence across the Indian Ocean" (PDF). Molecular Phylogenetics and Evolution. 25 (2): 267–277. doi:10.1016/S1055-7903(02)00254-3. PMID 12414309. Archived from the original (PDF) on 2007-09-14.
  8. ^ Helbig, A. J.; Seibold, I.; Bednarek, W.; Brüning, H.; Gaucher, P.; Ristow, D.; Scharlau, W.; Schmidl, D. & Wink, Michael (1994): Phylogenetic relationships among falcon species (genus Falco) according to DNA sequence variation of the cytochrome b gene. In: Meyburg, B.-U. & Chancellor, R. D. (editors): Raptor conservation today: 593–599.
  9. ^ Wink, Michael; Seibold, I.; Lotfikhah, F. & Bednarek, W. (1998): Molecular systematics of holarctic raptors (Order Falconiformes). In: Chancellor, R. D., Meyburg, B.-U. & Ferrero, J. J. (editors): Holarctic Birds of Prey: 29–48. Adenex & WWGBP.
  10. ^ Ragusa-Netto, J. (2000). "Raptors and "campo-cerrado" bird mixed flock led by Cypsnagra hirundinacea (Emberizidae: Thraupinae)". Revista Brasileira de Biologia. 60 (3): 461–467. doi:10.1590/S0034-71082000000300011. PMID 11188872.
  11. ^ Silveira, Leandro; Jácomo, Anah T. A.; Rodrigues, Flávio H. G. & Crawshaw, Peter G. Jr. (1997). "Hunting Association Between the Aplomado Falcon (Falco femoralis) and the Maned Wolf (Chrysocyon brachyurus) in Emas National Park, Central Brazil" (PDF). The Condor. 99 (1): 201–202. doi:10.2307/1370238. JSTOR 1370238.
  12. ^ Meyer, R. A.; Williams, S. O. (2005). "Recent Nesting and Current Status of Aplomado Falcon (Falco femoralis) in New Mexico". North American Birds. 59: 352–356.
  13. ^ "Aplomado Falcon". Forest Guardians. 2008. Archived from the original on October 5, 2008. Retrieved July 31, 2008.
  14. ^ McClure, C. J. W.; Pauli, B. P.; Mutch, B.; Juergens, P. (2017). "Assessing the importance of artificial nest-sites in the population dynamics of endangered Northern Aplomado Falcons Falco femoralis septentrionalis in South Texas using stochastic simulation models". Ibis. 159 (1): 14–25. doi:10.1111/ibi.12419.
  15. ^ Stephanie Paige Ogburn, "Bred for Success," High Country News, 13 Nov 2006
  16. ^ "Groups file suit over endangered falcon protections". wildearthguardians.org. Associated Press. 13 September 2006. Retrieved 22 July 2017.
  17. ^ "Federal judge in N.M. to consider legality of falcon decision". wildearthguardians.org. Albuquerque Journal. 21 May 2008. Retrieved 22 July 2017.
  18. ^ W.G. Hunt et al., "Restoring Aplomado Falcons to the United States," J. Raptor Research vol. 47, p. 335-351, 2013
  19. ^ See "Archived copy" (PDF). Archived from the original (PDF) on 2014-08-20. Retrieved 2014-08-19.CS1 maint: Archived copy as title (link) and "Archived copy" (PDF). Archived from the original (PDF) on 2014-08-20. Retrieved 2014-08-19.CS1 maint: Archived copy as title (link).

Further reading

  • Stiles, F. Gary & Skutch, Alexander Frank (1989): A guide to the birds of Costa Rica. Comistock, Ithaca. ISBN 0-8014-9600-4

External links


An avivore is a specialized predator of birds, with birds making up a large proportion of its diet. Such bird-eating animals come from a range of groups.

Bat falcon

The bat falcon (Falco rufigularis) is a falcon that is a resident breeder in tropical Mexico, Central and South America, and Trinidad. It was long known as Falco albigularis; the names Falco fusco-coerulescens or Falco fuscocaerulescens, long used for the aplomado falcon, are now believed to refer to the present species.The female bat falcon, at 30.5 cm length, is much larger than the 23-cm-long male. Adults have a black back, head, and tail. The throat, upper breast, and neck sides are creamy white, the lower breast and belly are black, finely barred white, and the thighs and lower belly are orange. Young birds are similar, but with a buffy throat. The call of this species is a high pitched ke-ke-ke like the American kestrel.

It is probably closely related to and looks like a small version of the orange-breasted falcon. These two, in turn, are probably closest to the aplomado falcon and constitute a rather old American lineage of Falco species.This small dark bird of prey inhabits open woodlands and forest clearings. Bat falcons perch conspicuously on high, open snags, from which they launch aerial attacks on their prey. They hunt bats, birds, and large insects such as dragonflies. The smaller male takes more insects, and the female more birds and bats. The flight is direct and powerful. This falcon is partly crepuscular, as the bats in its diet suggest. It lays two or three brown eggs in an unlined treehole nest.

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The falcons are the largest genus in the Falconinae subfamily of Falconidae, which itself also includes another subfamily comprising caracaras and a few other species. All these birds kill with their beaks, using a "tooth" on the side of their beaks—unlike the hawks, eagles, and other birds of prey in the Accipitridae, which use their feet.

The largest falcon is the gyrfalcon at up to 65 cm in length. The smallest falcons are the kestrels, of which the Seychelles kestrel measures just 25 cm. As with hawks and owls, falcons exhibit sexual dimorphism, with the females typically larger than the males, thus allowing a wider range of prey species.Some small falcons with long, narrow wings are called "hobbies" and some which hover while hunting are called "kestrels".As is the case with many birds of prey, falcons have exceptional powers of vision; the visual acuity of one species has been measured at 2.6 times that of a normal human. Peregrine falcons have been recorded diving at speeds of 200 miles per hour (320 km/h), making them the fastest-moving creatures on Earth. The fastest recorded dive for one is 390 km/h.

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