Pygmy Short-horned Lizard
Scientific Name: Phrynosoma douglasii
Other/Previous Names: Pigmy Short-horned Lizard ,Pygmy Short-horned Lizard (British Columbia population)
Taxonomy Group: Reptiles
Range: British Columbia
Last COSEWIC Assessment: April 2007
Last COSEWIC Designation: Extirpated
SARA Status: Schedule 1, Extirpated
Image of Pygmy Short-horned Lizard
The Pygmy Short-horned Lizard was recently recognized as a separate species. It is the smallest of the horned lizards, rarely exceeding 6 cm from its snout to vent. Compared to some other ornately armored horned lizards, the Pygmy Short-horned Lizard has relatively small horns on its head and body. It is often referred to (incorrectly) as a horned toad. All 13 species of horned lizards are confined to the arid and semi-arid portions of North and Central America. (Updated 2017/05/25)
Distribution and Population
The Pygmy Short-horned Lizard inhabits the Great Basin and surrounding areas from northern California and Nevada through eastern Oregon and Washington, most of southern and eastern Idaho and into the extreme south-central part of British Columbia, in the Okanagan and Similkameen Valleys. (Updated 2017/05/25)
A broad variety of habitats are used from deep-soiled desert basins to shallow-soiled slopes and ridges. Consistent features are well-drained sites with exposed ground and access to friable soils for burrowing, thermoregulating and foraging. The Okanagan and Similkameen Valleys still appear to have suitable habitat for this species, and some of this habitat is currently protected. Parts of the Pygmy Short-horned Lizard’s range are over 2000 m above sea level. (Updated 2017/05/25)
Pygmy Short-horned Lizards give birth to up to 15 live young, unlike some other horned lizards that lay eggs. Sexual maturity in females usually occurs in their third year. Longevity is unknown but is at least five years in the wild. Like all temperate-zone reptiles, Pygmy Short-horned Lizards must hibernate through the winter, which they do in shallow burrows. The primary prey of all horned lizards is ants, especially the harvester ant. Other invertebrates, such as beetles, grasshoppers, and snails, are also eaten, most commonly by adults. Foraging starts after the lizards have warmed in the morning sun and continues until the heat of the afternoon when they seek refuge in shade or a burrow. Pygmy Short-horned Lizards have many potential predators, including birds, snakes, coyotes and weasels. The first line of defence is remaining motionless, to take advantage of their cryptic colouration, texture, and posture. If detected, the lizards can flee from slow moving predators or inflate their bodies and make intimidating gestures. Their horn-like projections are minor deterrents, but can be effective against predators that must swallow them whole. Some horned lizards are capable of shooting a stream of foul-tasting blood into the mouths of certain predators, but this behaviour has not been observed in Pygmy Short-horned Lizards. (Updated 2017/05/25)
Reasons for extirpation
Habitat loss has been extensive in the Okanagan Valley and to a lesser extent in the Similkameen Valley. Although this habitat loss is likely a contributing factor to the species’ extirpation, it appears that Pygmy Short-horned Lizards were already rare by the early 1900s. This rarity may have been a result of relatively recent colonization, trampling by many large herds of cattle driven through this narrow valley en route to the Cariboo goldrush, or severe population declines when extreme cold or prolonged winters with little snowfall caused mortality during hibernation. If the species were reintroduced, current potential threats would include extensive habitat loss, road mortality, and predation by native and exotic animals. (Updated 2017/05/25)
Federal ProtectionThe Pygmy Short-horned Lizard is protected under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
In the event it is rediscovered, the Pygmy Short-horned Lizard is protected under the Wildlife Act (1990) and the Wildlife Amendment Act (2004) of British Columbia.
Provincial and Territorial Protection
Status of Recovery Planning
Recovery Strategies :
Name Recovery Strategy for the Pygmy Short-horned Lizard (Phrynosoma douglasii) in Canada
Status First posting on SAR registry
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
8 record(s) found.
- COSEWIC Status Reports (1 record(s) found.)
- COSEWIC Assessments (1 record(s) found.)
- Response Statements (1 record(s) found.)
- Recovery Strategies (1 record(s) found.)
- Orders (1 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
- Consultation Documents (1 record(s) found.)
- Recovery Document Posting Plans (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
COSEWIC Annual Report - 2007 (2007)2007 Annual Report to the The Minister of the Environment and the Canadian Endangered Species Conservation Council (CESCC) from the Committee on the Status of Endangered Wildlife in Canada.
Recovery Document Posting Plans
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