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Pulsatrix perspicillata
spectacled owl


By Cecilia Patino

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Aves
Order: Strigiformes
Family: Strigidae
Genus: Pulsatrix
Species: Pulsatrix perspicillata
Members of this Species

Geographic Range

Pulsatrix perspicillata can be found from Southern Mexico through Argentina. It can also be found on Carribean islands such as Trinidad. (Burton, et al., 1984; Owl Pages, Date Unknown)

Biogeographic Regions
neotropical (Native )

Habitat

Range elevation
0 to 1600 m
(0.00 to 5249.34 ft)

Spectacled owls live near water in rainforest and woodlands. They can be found from sea level to elevations of 1600 m. (Burton, et al., 1984; Owl Pages, Date Unknown; Owling.com, 2002)

Habitat Regions
temperate ; tropical

Terrestrial Biomes
forest ; rainforest

Other Habitat Features
riparian

Physical Description

Range mass
453 to 906 g
(15.96 to 31.93 oz)

Range length
43 to 46 cm
(16.93 to 18.11 in)

Range wingspan
0.762 to 0.914 m
(2.50 to 3.00 ft)

Spectacled owls are characterized by white "spectacles" around their bright yellow eyes. They have dark brown plumage on their upper parts and off-white or light yellow plumage on their breast. They have a thin white stripe around the throat with a thick dark brown stripe below. Coloration is reversed in juveniles; they are mostly white with a brown/black facial disk.

Spectacled owls are 43 to 46 cm long, males weigh 453 to 680 g and females weigh 680 to 906 g. Their wingpans are from 0.762 to 0.914 m. (Burton, et al., 1984; Owl Pages, Date Unknown; Owling.com, 2002; Sedgwick County Zoo, 2001)

Sexual Dimorphism
female larger

Development

The incubation period of an embryo is from 6-8 months. Juveniles leave the nest before they are able to fly, but frequently return to eat. They go through almost five years of molting before they attain their adult plummage when in captivity.In the wild they may molt within three years.They attempt to fly within two years. Yet only after the long molting period can they fly efficiently.(Burton, 1984)

Reproduction

Spectacled owls are monogamous.

Mating System
monogamous

Breeding season
Breeding occurs in the dry season or the beginning of the wet season.

Range eggs per season
1 to 2

Average eggs per season
2
[External Source: AnAge]

Average time to hatching
36 days
[External Source: AnAge]

Range age at sexual or reproductive maturity (female)
3 to 5 years

Range age at sexual or reproductive maturity (male)
3 to 5 years

Breeding occurs in the dry season or the beginning of the wet season (April to June or September to October depending on location). They build their nests inside tree cavities. Females lay a maximum of two eggs and often only one chick will survive. Young fledge after 5 to 6 weeks; they are often dependent on their parents for up to a year. Spectacled owls reach maturity in 3 to 5 years. (Austin, 1971; Owl Pages, Date Unknown; Owling.com, 2002)

Key Reproductive Features
seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization

Both the male and female assist in raising young, but most of the responsiblity rests on the female. They each take turns sitting on the eggs while the other goes out to hunt. The chicks leave the nest before they can fly and often remain with their parents for a year after fledging. (Owl Pages, Date Unknown; Owling.com, 2002)

Parental Investment
no parental involvement; altricial ; pre-fertilization; pre-hatching/birth (Protecting: Male, Female); pre-weaning/fledging (Provisioning); pre-independence (Provisioning)

Lifespan/Longevity

Range lifespan
Status: wild

35 (high) years

Range lifespan
Status: captivity

25 to 30 years

Average lifespan
Status: captivity

25 years
[External Source: AnAge]

With very few predators, this species can live up to 35 years in the wild. They are known to live for 25 to 30 years in captivity.

Behavior

Spectacled owls are typically nocturnal, but have been known to hunt during the day on some occasions. They are not known to be migratory. (Owling.com, 2002)

Key Behaviors
flies; diurnal ; nocturnal ; sedentary

Home Range

We do not have information on home range for this species at this time.

Communication and Perception

Males have a distinct call that sounds like a hammer hitting a hollow tree repeatedly; the sound descends in volume. Females have a loud screeching call used mostly to attract males during the mating season. (Owl Pages, Date Unknown; Owling.com, 2002)

Communication Channels
acoustic

Food Habits

Spectacled owls are very fast, and once they spot their prey they will swoop down, snatch up the prey, and return to their perch. They will also glean insects from vegetation. They are carnivorous and mostly eat mice and insects. They are also known to eat crabs, bats, possums, skunks, frogs and smaller birds no larger than a blue jay. They usually hunt at night, but will occasionally hunt during the day. (Owl Pages, Date Unknown; Owling.com, 2002; Sedgwick County Zoo, 2001)

Animal Foods
birds; mammals; amphibians; insects; terrestrial non-insect arthropods

Predation

Known Predators


Because spectacled owls hide in foliage that hangs low, they are not easily detected by predators. They are sometimes preyed upon by larger birds (class Aves).

Ecosystem Roles

Spectacled owls are important members of their ecosystem; because of their food habits they likely have a regulatory influence on insect and mammal populations, and they are an important food source for their predators.

Economic Importance for Humans: Positive

Spectacled owls help eliminate pests species, such as insects and mice that can destroy crops.

Positive Impacts
controls pest population

Economic Importance for Humans: Negative

There are no known adverse affects of spectacled owls on humans.

Conservation Status

IUCN Red List [Link]
Least Concern

CITES [Link]
Appendix II

Spectacled owls are listed under Appendix II by CITES but have not been evlauated by the IUCN. They could become severely threatened if rainforests and other forested areas in South America continue to be cut down for agriculture and lumber industries.

There have already been efforts to conserve spectacled owls. Many are bred in captivity and released in the wild, while others are kept in zoos and conservatories.

For More Information

Find Pulsatrix perspicillata information at

Contributors

Alaine Camfield (editor), Animal Diversity Web.

Cecilia Patino (author), University of Michigan, Kerry Yurewicz (editor), University of Michigan.

References

Austin, O. 1971. Families of Birds. New York: Golden Press.

Burton, P., M. Fogden, H. Ginn, D. Glue, G. Hekstra. 1984. Owls of the World. Great Britiain: Peter Lowe.

Owl Pages, Date Unknown. "Spectacled Owls - Pulsatrix perspicillata" (On-line). Accessed February 25, 2004 at http://www.owlpages.com/species/pulsatrix/perspicillata/Default.htm.

Owling.com, 2002. "Spectacled Owl - Pulsatrix perspicillata" (On-line). Accessed February 11, 2004 at http://owling.com/Spectacled.htm.

Perrins, C., A. Middleton. 1985. The Encyclopedia of Birds. New York: Facts on File.

Sedgwick County Zoo, 2001. "Sedgwick County Zoo- See our World" (On-line). Accessed 02/11/04 at http://www.scz.org/animals/o/spowl.html.

To cite this page: Patino, C. 2002. "Pulsatrix perspicillata" (On-line), Animal Diversity Web. Accessed February 12, 2012 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Pulsatrix_perspicillata.html

Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.

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