Rufous-legged owl

Rufous-legged owl
Adult, Ñuble forest, Chile
CITES Appendix II (CITES)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Strigiformes
Family: Strigidae
Genus: Strix
Species:
S. rufipes
Binomial name
Strix rufipes
King, 1827

The rufous-legged owl (Strix rufipes) is a medium-sized owl. It is found in Argentina and Chile.[3]

Taxonomy and systematics

The rufous-legged owl has two subspecies, the nominate Strix rufipes rufipes and S. r. sanborni. The latter is known from a single immature specimen. At one time what is now treated as the Chaco owl (Strix chacoensis) was also considered to be a subspecies of rufous-legged owl, but the two differ in plumage, morphology, and voice.[3][4]

Chick, Ñuble forest, Chile

Description

The rufous-legged owl is compact, with a round head and no ear tufts. It is 33 to 38 cm (13 to 15 in) long and weighs about 350 g (12 oz); females are larger than males. Adults have a rusty facial disk, white "brows" over dark brown eyes, and white lores. Its upperparts are dark reddish brown with narrow orange-buff bars and spots. The tail is also reddish brown, with buff bars. The throat is white, most of the underparts are buffy white with many black bars, and the vent area is orange-buff. The legs and toes are covered with buffy feathers. The chick is downy off-white. The juvenile is a warm buff with faint dusky brown barring and a tawny face.[4]

Distribution

The rufous-legged owl is found in Chile from approximately Valparaíso Province and in far western Argentina from approximately Mendoza Province south to the tip of Tierra del Fuego. The one specimen of S. r. sanborni was taken on Chiloé Island off the coast of south-central Chile. The species primarily inhabits moist old-growth forest with a closed canopy and a dense understory. It is also found in older secondary forest and semi-open forest. In elevation it ranges from sea level to at least 2,000 m (6,600 ft).[4]

Behavior

Feeding

The rufous-legged owl is nocturnal and usually hunts from a perch. Its primary prey is small arboreal mammals. Birds, amphibians, and insects are also taken but account for only a small percentage of its diet.[4]

Breeding

The rufous-legged owl's breeding phenology is poorly known. It probably lays eggs beginning in October; the clutch size is one to three eggs. It usually nests in a tree cavity, either natural or excavated by a woodpecker. It occasionally will use an old raptor nest and is thought to possibly nest on the ground as well.[4]

Vocalization

Dickcissel male perched on a metal pole singing, with neck stretched and beak open.

Songs and calls
Listen to rufous-legged owl on xeno-canto

The rufous-legged owl's vocalizations are "a variety of grunting, hooting, and cackling noises."[4]

Status

The IUCN has assessed the rufous-legged owl as being of Least Concern.[1] It occurs in several protected areas but outside them is potentially threatened by logging of its mature-forest habitat.[4]

References

  1. ^ a b BirdLife International (2016). "Rufous-legged Owl Strix rufipes". IUCN Red List of Threatened Species. 2016. Retrieved 8 September 2021.
  2. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ^ a b Gill, F.; Donsker, D.; Rasmussen, P. (July 2021). "IOC World Bird List (v 11.2)". Retrieved July 14, 2021.
  4. ^ a b c d e f g Holt, D. W., R. Berkley, C. Deppe, P. L. Enríquez, J. L. Petersen, J. L. Rangel Salazar, K. P. Segars, K. L. Wood, and J. S. Marks (2020). Rufous-legged Owl (Strix rufipes), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.rulowl1.01 retrieved September 8, 2021