Costa Rican pygmy owl

Costa Rican pygmy owl
Savegre Lodge, near San Gerardo, Costa Rica
Conservation status
Least Concern  (IUCN 3.1) [1]
CITES Appendix II (CITES) [2]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Strigiformes
Family:	Strigidae
Genus:	Glaucidium
Species:	G. costaricanum
Binomial name
Glaucidium costaricanum Kelso, L, 1937
Distribution of Costa Rican pygmy owl   Resident

The Costa Rican pygmy owl (Glaucidium costaricanum) is a small "typical owl" in subfamily Surniinae. It is found in Costa Rica and Panama. ^{[3] [4]}

Taxonomy and systematics

Initially, the Costa Rican pygmy owl was described as a subspecies of the Andean pygmy owl (G. jardinii); in 2000, the North American Classification Committee (NACC), of what was then the American Ornithologists' Union (now the American Ornithological Society), accepted it as a separate species, with other taxonomic systems following-suit. The Costa Rican pygmy owl is more closely related to the northern pygmy owl complex (G. gnoma sensu lato ) than to the Andean. ^{[5] [3] [4] [6]} The species is monotypic. ^[3]

Description

The Costa Rican pygmy owl is around 14.5 to 17 cm (5.7 to 6.7 in) long, with males weighing about 53 to 70 g (1.9 to 2.5 oz), while the larger females weigh as much as 99 g (3.5 oz). Adults have two color morphs; one is mostly brown and the other is rufous. The head and upper body parts are a basal color with lighter, paler spots; the tail is the same color, with four white bands and a white tip. The nape has a pair of blackish spots with pale borders that resemble "eyes" on the back of the head. The breast and belly are white and the flanks are the basal color. The facial disc is the basal color, with narrow buff and white marks, while the eyes and feet are yellow, the maxilla greenish yellow, and the mandible is a light brown with a yellow tip. ^[7]

Distribution and habitat

The Costa Rican pygmy owl is typically found, at some elevation, within the Cordillera Central and Cordillera de Talamanca of Costa Rica, and (patchily) into western Panama, where it inhabits the canopy and edges of humid montane oak and evergreen forests. In its native Costa Rica, the species ranges from about 900 to 3,000 m (3,000 to 9,800 ft) above sea level, on the Caribbean slope, and from 1,200 to 3,000 m (3,900 to 9,800 ft) on the Pacific slope. ^{[7] [8]}

Behavior

Movement

The Costa Rican pygmy owl is a year-round resident throughout its range. ^[7]

Feeding

The Costa Rican pygmy owl forages both day and night. It hunts from a low perch in dense foliage and takes prey in "a short, swift dash". If the target is missed, the bird typically returns to the perch rather than pursuing. Its diet has not been defined in detail but is known to include birds, small mammals and other vertebrates, and large arthropods. Like other pygmy owls, they swish their tails from side to side when agitated. ^[7]

Breeding

The Costa Rican pygmy owl's breeding phenology is not well known. It nests in naturally-occurring tree crevices and holes, and may potentially repurpose the disused nests of woodpeckers or other tree-dwelling birds. Average clutch sizes are not certain, though one nest found in March 2020 contained three eggs. ^[7]

Songs and calls Listen to Costa Rican pygmy owl on xeno-canto

Vocalization

The Costa Rican pygmy owl's song is "a long series of clear, unmodulated toots in an irregular rhythm". The toots can be in pairs, in a series of three pairs, or in a continuous series of single notes. When excited, it gives a faster, higher-pitched series of five toots. ^[7]

Status

The IUCN has assessed the Costa Rican pygmy owl as being of Least Concern. Though its population size is not known, it is believed to be stable. No specific threats have been identified. ^[1] It is considered rare in Panama and rare to locally fairly common in Costa Rica. "Human activity has little short-term direct effect on [the] Costa Rican Pygmy-Owl, other than the local effects of habitat destruction." ^[7]

References

1. BirdLife International (2016). "Costa Rican Pygmy-owl Glaucidium costaricanum". IUCN Red List of Threatened Species . 2016: e.T22729005A95003007. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22729005A95003007.en . Retrieved 7 March 2022.
2. "Appendices | CITES". cites.org. Retrieved 2022-01-14.
3. Gill, F.; Donsker, D.; Rasmussen, P., eds. (January 2022). "Owls". IOC World Bird List. v 12.1. Retrieved January 15, 2022.
4. HBW and BirdLife International (2020) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world Version 5. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v5_Dec20.zip [.xls zipped 1 MB] retrieved 27 May 2021
5. Richard C. Banks, Carla Cicero, Jon L. Dunn, Andrew W. Kratter, Henri Ouellet, Pamela C. Rasmussen, J. V. Remsen, Jr., James D. Rising, and Douglas F. Stotz. "Forty-second supplement to the American Ornithologists' Union Check-list of North American Birds". The Auk 2000, vol. 117:847-858 retrieved March 7, 2022
6. Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, J. A. Gerbracht, D. Lepage, B. L. Sullivan, and C. L. Wood. 2021. The eBird/Clements checklist of Birds of the World: v2021. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ Retrieved 25 August 2021
7. Schulenberg, T. S. (2020). Costa Rican Pygmy-Owl (Glaucidium costaricanum), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.crpowl.01 retrieved March 7, 2022
8. Garrigues, Richard; Dean, Richard (2007). The Birds of Costa Rica: A Field Guide. Ithaca, NY: Comstock Publishing Associates/Cornell University Press. pp. 108–109. ISBN   978-0-8014-7373-9.