email a friend
printable version
VU
Giant Antpitta Grallaria gigantea

Justification
This species has a very small range, within which its habitat is continuing to decline. It consequently qualifies as Vulnerable (Collar et al. 1992).

Taxonomic source(s)
SACC. 2006. A classification of the bird species of South America. Available at: http://www.museum.lsu.edu/~Remsen/SACCBaseline.html.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.

Identification
26.5 cm. Huge antpitta with thick, heavy bill. Olive-brown above. Pale grey hindcrown and nape. Deep rusty sides of head and entire underparts, with black edged throat and breast feathers giving wavy, barred appearance. Similar spp. Undulated Antpitta G. squamigera is marginally smaller, with yellowish underparts and pale malar. Voice Low-pitched trill (14-21 notes per second), rising in pitch and amplitude, 4-8 seconds long with intervals from 4-12 seconds. Very similar to G. squamigera, but slightly longer in duration and delivery-rate does not decrease at the end of each song-bout.

Distribution and population
Grallaria gigantea has three subspecies in the Andes of Ecuador and south-west Colombia. In Colombia, subspecies lehmanni is known from historical specimens taken on both slopes of the Central Andes in Cauca and Huila, while both recent records (1988 and 1989) are from La Planada Nature Reserve, Nariño (subspecies unknown) (de Soye et al. 1997). In Ecuador, the only recent records of the nominate subspecies are from west Napo, but older records exist from eastern Carchi and Tungurahua; and the subspecies hylodroma is known from a few localities on the west slope of the Andes in Pichincha and Cotopaxi (Krabbe et al. 1994b, N. Krabbe in litt. 1999, Ridgely and Greenfield 2001). Some uncertainty surrounds the origin of two old specimens described as hylodroma from El Tambo (probably in western Cañar province) and Cerro Castillo, western Pichincha (J. F. Freile in litt. 2000, 2002, 2007).


Population justification
The population is estimated to number 1,000-2,499 individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals.

Trend justification
This species's population is suspected to be declining slowly, in line with rates of habitat loss within its range.

Ecology
It inhabits humid montane forest in the upper subtropical to temperate zones, with lehmanni known from 3,000 m, gigantea from 2,200-2,600 m or above, and hylodroma from 1,200-2,000 m. It frequents swampy areas in humid cloud-forest understorey, but has also been recorded in adjacent pastures (presumably only for brief foraging periods) and secondary forest (Krabbe et al. 1994b). Observations of hylodroma and gigantea indicate that giant earthworms Rhynodrilus are important dietary components, with beetle larvae and slugs also eaten (Krabbe et al. 1994b, de Soye et al. 1997). Information on nesting is provided by Solano-Ugalde et al. (2009).


Threats
At the latitude where subspecies lehmanni occurred, land use on both slopes of the Central Andes has been almost wholly agricultural at lower to mid-elevations since the early 20th century or before, and forest loss continues at higher altitudes where the species may persist. Cloud-forests in the West Andes of Nariño, Colombia have suffered extensive deforestation through logging and conversion to agriculture and narcotics plantations, while logging and agricultural conversion have also lead to extensive deforestation in Pichincha, Ecuador. Habitat destruction continues throughout the Pacific slope (Krabbe et al. 1998, Robbins and Stiles 1999, P. G. W. Salaman in litt. 1999, 2000).. The east slope forests in Ecuador are more intact and secure but deforestation is occurring in at lower altitudes (around 1,000 m).

Conservation Actions Underway
If the Colombian race lehmanni is extant, it probably occurs in Puracé National Park, where it was collected in 1941 (Wege and Long 1995, P. G. W. Salaman in litt. 1999, 2000). Searches for the species at La Planada Nature Reserve in the 1990s were unsuccessful (de Soye et al. 1997, P. G. W. Salaman in litt. 1999, 2000). Subspecies hylodroma is protected in the Mindo-Nambillo Protection Forest and Maquipucuna, Otonga and Río Guajalito Reserves in Ecuador, and may occur in other protected areas (Robbins and Stiles 1999, Wege and Long 1995, J. F. Freile in litt. 2000, 2002, 2007). There are no records from the large Cotacachi-Cayapas Ecological Reserve, north of Pichincha, and only two recent records from the surrounding areas of Illinizas Ecological Reserve, but distribution models predict the occurrence of hylodroma in both protected areas (Freile et al. 2010). The nominate race is protected at San Isidro Lodge and at least partially at Antisana Ecological Reserve (J. F. Freile in litt. 2000, 2002, 2007). Conservation Actions Proposed
Survey to reconfirm historical, and locate additional, sites for the species (P. G. W. Salaman in litt. 1999, 2000). Estimate population densities at known sites. Increase the area of suitable habitat that has protected status.

References
Collar, N. J.; Gonzaga, L. P.; Krabbe, N.; Madroño Nieto, A.; Naranjo, L. G.; Parker, T. A.; Wege, D. C. 1992. Threatened birds of the Americas: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, Cambridge, U.K.

de Soye, Y.; Schuchmann, K.-L.; Matheus, J. C. 1997. Field notes on the Giant Antpitta Grallaria gigantea. Cotinga: 35-36.

Freile, J. F.; Parra, J. L.; Graham, C. H. 2010. Distribution and conservation of Grallaria and Grallaricula antpittas (Grallariidae) in Ecuador. Bird Conservation International 20(4): 410-431.

Freile, J. F.; Parra, J. L.; Graham, C. H. 2010. Distribution and conservation of Grallaria and Grallaricula antpittas (Grallariidae) in Ecuador. Bird Conservation International 20(4): 410-431.

Krabbe, N.; DeSmet, G.; Greenfield, P.; Jácome, M.; Matheus, J. C.; Sornoza M., F. 1994. Giant Antpitta Grallaria gigantea. Cotinga: 32-34.

Krabbe, N.; Skov, F.; Fjeldså, J.; Petersen, I. K. 1998. Avian diversity in the Ecuadorian Andes - an atlas of distribution of Andean forest birds and conservation priorities. Centre for Research on Cultural and Biological Diversity of Andean Rainsforests (DIVA), Ronde, Denmark.

Paynter, R. A. 1993. Ornithological gazetteer of Ecuador. President and Fellows of Harvard College, Harvard.

Ridgely, R. S.; Greenfield, P. J. 2001. The birds of Ecuador: status, distribution and taxonomy. Cornell University Press and Christopher Helm, Ithaca and London.

Robbins, M. R.; Stiles, F. G. 1999. A new species of pygmy-owl (Strigidae: Glaucidium) from the Pacific slope of the northern Andes. The Auk 116: 305-315.

Solano-Ugalde, A.; Paz, Á.; Paz, W. 2009. First description of the nest, nest site, egg and young of the Giant Antpitta (Grallaria gigantea). Ornitologia Neotropical 20(4): 633-638.

Solano-Ugalde, A.; Paz, Á.; Paz, W. 2009. First description of the nest, nest site, egg and young of the Giant Antpitta (Grallaria gigantea). Ornitologia Neotropical 20(4): 633-638.

Wege, D. C.; Long, A. J. 1995. Key Areas for threatened birds in the Neotropics. BirdLife International, Cambridge, U.K.

Further web sources of information
Detailed species account from the Threatened birds of the Americas: the BirdLife International Red Data Book (BirdLife International 1992). Please note, taxonomic treatment and IUCN Red List category may have changed since publication.

Recuento detallado de la especie tomado del libro Aves Amenazadas de las Americas, Libro Rojo de BirdLife International (BirdLife International 1992). Nota: la taxonomo

Text account compilers
Harding, M., Isherwood, I., Sharpe, C J, Symes, A.

Contributors
Freile, J., Krabbe, N., Salaman, P.

Recommended citation
BirdLife International (2014) Species factsheet: Grallaria gigantea. Downloaded from http://www.birdlife.org on 17/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/04/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Giant antpitta (Grallaria gigantea) 0

Key facts
Current IUCN Red List category Vulnerable
Family Formicariidae (Antthrushes and antpittas)
Species name author Lawrence, 1866
Population size 600-1700 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 13,400 km2
Country endemic? No
Links to further information
- Additional Information on this species