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Burrowing Owl

Latin name: Speotyto cunicularia
Taxonomic group: Birds
Risk category: Endangered 
Range: AB BC MB SK
Year of designation: 1995

Burrowing Owl Photo
Description:
The Burrowing Owl, commonly called a ground owl, is a greyish brown, round-headed owl lacking ear tufts. It has long slim legs and a short tail, and is smallish, about the size of a pigeon. The adults have a white abdomen with brown bars that are lacking on the young, which have a rusty throat instead. The Burrowing Owl is active both day and night, and may be seen standing erect on the ground, though its small size and earth-coloured plumage makes it difficult to spot. 
Biology:
These owls inhabit their breeding grounds from April to September. They are active day and night, though most active at dusk. Burrows abandoned by ground-dwelling mammals are enlarged by digging if necessary, then the interior is lined with vegetal matter in preparation for nesting. Each pair selects its own burrow, and may nest in isolation, or be part of a loose aggregation or small colony. Females lay four to twelve, usually no more than seven, eggs in their underground nest. There is a high rate of loss of eggs and young to predators such as other owls, hawks, snakes, badgers, skunks, foxes, cats and weasels. The young are most vulnerable when they first appear above ground in late June and early July, perching in tight groups on mounds in front of nest holes. The family breaks up in August, when the young disperse over the pastures.
The owls prey on grasshoppers and other large insects, as well as some small rodents and birds. 

Burrowing Owl Range Map Population and Distribution:
The Burrowing Owl occurs in western North America in open country from southern Canada to Mexico. The Canadian population occurs mostly in a belt from Regina, Saskatchewan to Brooks, Alberta. It nests east to Winnipeg, west to Calgary, north to Dauphin, Prince Albert and Wetaskawin, and infrequently in B.C.'s southern interior. The wintering range is likely southwestern United States or Mexico. Individuals sometimes but rarely wander into coastal British Columbia in winter and into Ontario and Quebec in spring. 

The Canadian population has always been limited by habitat availability, but early agricultural development increased the amount and distribution of habitat by clearing brush-covered land. Burrowing Owl numbers peaked from the early 1900s to 1930s, then declined. About 2000 pairs existed in Canada in 1977: 100 in Manitoba; 1300 in Saskatchewan; 600 in Alberta; and a few in British Columbia. The Canadian population fell from 1685 to 1010 in 1995.
The species is now absent or rare in regions where it was once common. Unless the trend is reversed, the Burrowing Owl will likely become extirpated from Manitoba within a few years, and from all of Canada within a few decades. 
 


Habitat:
The Burrowing Owl requires open terrain largely free of visual obstructions, such as pastures grazed by livestock. It uses burrows abandoned by ground-dwelling mammals (e.g., badgers, gophers and prairie dogs) for nesting, roosting and cashing food. Short or sparse vegetation and permanent cover are required around the burrows to support prey. In the Prairies, the owls are found in undulating, treeless plains; in British Columbia, they nest in dry grasslands, bench lands and valley bottoms. The species is sometimes found on roadsides and crop lands and in urban areas where mowing keeps expanses of grass short. 
Threats:
The availability of suitable burrows, or some sort of hole in the ground, is essential to Burrowing Owl habitation. In addition to serving as nesting sites, burrows provide shelter from wind, rain, sun, and predatory hawks. Unfortunately, cultivation of pastures, extermination of ground squirrels, and other agriculture techniques have combined to reduce the number of suitable burrows. The use of chemical pesticides to control grasshoppers and other insects is both poisoning owls and reducing an important food supply. When shortage of food forces the birds to forage far from their nesting sites, they become more susceptible to predation. Other factors that can contribute to the decline of this species include inclement weather during incubation, illegal shooting, and collisions with motor vehicles. 
Protection:
The Burrowing Owl is protected by provincial legislation in all four western provinces. It has been designated endangered in British Columbia, Alberta and Manitoba, and is on Alberta's red list. 
Recovery efforts:
A Recovery plan for the Burrowing Owl was approved in 1995. The goal of the plan is to increase populations of this species in Canada to self-sustaining levels, such that the species is no longer considered endangered or threatened.

The recovery objectives for 1998/1999 are: 
1) to launch new studies to investigate the food supply and male foraging habits of the owl, to
determine why over half of the young are suffering from starvation to the extent that they do not fledge; 
2) to continue supplementing the food supply of the owls; 
3) to undertaken new research to determine the survival potential of captive-raised owls; and
4) to organize an international Burrowing Owl symposium in Utah, with the objective of determining whether the species' decline is widespread outside of Canada and to focus on conservation and recovery efforts in western North America. 

The long-term objectives of the recovery plan are: 
1) to reverse the declining population trends on the prairies and to maintain a stable or increasing population averaging over 3,000 pairs for 10 years;
2) to establish a viable population in B.C. and maintain this population at an average of more than 50 pairs for 10 years.

Summary of research and monitoring activities: 
- 1987-1996: extensive inventory work in Manitoba. 
- 1989 to present: studies in Mexico and Texas were undertaken to identify and investigate the wintering grounds of the Burrowing Owl. 
- 1994 to present: researchers from the Saskatchewan Department of Environment and Resource Management and the University of Alberta continued a productivity project in the intensively cultivated area known as the Regina Plains.
- 1997 to 1998: field surveys identified two owls that were tagged in Canada wintering in south Texas. Most of the owls observed in Texas were on heavily cultivated land. 

Summary of recovery actions: 
- 1987 to 1996: management activities in Manitoba included widespread extension efforts, releases of captive-reared young, provision of artificial nest burrows and protection of critical nesting sites.
- 1987 to present: the Operation Burrowing Owl program is in operation, which currently involves over 700 landowners in Alberta and Saskatchewan and protects 50,000 ha of nesting habitat. The number of protected sites has increased slightly in recent years though the number of owls has decreased dramatically.
- early 1990s: use of the pesticide carbofuran was banned within 250 m of owl nest sites. 
- 1994 to present: artificial nest burrows are being built and supplemental food is being provided to preserve the declining owl population around Regina, Saskatchewan.
- 1995: a ban on liquid carbofuran was enacted by the federal and Saskatchewan governments. 

Summary of progress to date: 
Monitoring efforts have documented the owl's significant decline in the past decade. The Burrowing Owl has been extirpated from B.C. and is in danger of being extirpated from Manitoba as well. The species has declined in Alberta and Saskatchewan by 16% annually over the past decade. To date recovery efforts have been unsuccessful at reversing the decline or identifying the key factors that are causing the decline. 

 


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