B.C. Reptiles & Amphibians

Credit: Antje Schultner

Common Wall Lizard

Podarcis muralis

Description

Other names: European Wall Lizard

The Common Wall Lizard (also referred to as the European Wall Lizard) is the only known introduced reptile species to have established breeding populations in British Columbia. The introduction has been traced back to a few lizards released in Saanich in 1967, and about a dozen animals from a small private zoo that were released in West Saanich in 1970. They now range as far north as Campbell River and south to Metchosin on Vancouver Island, and have appeared on a few other islands. As of 2021, they have established themselves in three areas on the lower mainland. Common Wall Lizards have an angular head and prominent jaw with a flattened body and long limbs and toes. They typically reach 16-23 cm in total length, with females tending to be shorter and lighter than males. Most of the length of the Wall lizard is in the tail, which is about twice as long as the body. They are green or brown with dark blotches on the back and have a light cream-coloured belly with black blotches. Males have bright blue spots along the sides that may look like a thick continuous line. This may also be observed in females, but the spots are typically much smaller and lighter. When captured by a predator, the Common Wall Lizard may autotomize their tails, which will twitch and wiggle for several minutes distracting the predator and allowing the lizard to escape. The tail begins to heal immediately and will grow back, typically in a different colour or pattern than the original.

Listen to the Indigenous words for “lizard” here!

Similar Species

The Common Wall Lizard loosely resembles the Northern Alligator Lizard, although the two are easily distinguished by body shape and colour. The Northern Alligator Lizard has less noticeable patterning, is stouter and shorter, and is far more widespread in British Columbia.

Northern Alligator Lizard

Common Wall Lizard

Distribution

Common Wall Lizards are native to Europe and central Asia, but have been introduced to southern England and North America. In British Columbia, they range from Campbell River south to Metchosin on Vancouver Island, and have established populations on Salt Spring and Denman Islands. Single lizards have been found in Ucluelet, Hand Island and North Pender Island and there are three established populations on the BC mainland (Powell River, Delta, and the Vedder Crossing area near Chilliwack). The spread of Common Wall Lizards appears to be due to accidental transport and people intentionally collecting and releasing them at new locations.

Habitat

The Common Wall Lizard is a ground-dwelling species that prefers open, exposed sites with cover objects such as rocks, logs, and debris piles, and typically avoids forested areas. In British Columbia they are commonly found in residential gardens, around driveways, or on houses, although they have been spotted in rocky natural areas, along fence lines, and in roadside ditches. Wall Lizards are not tolerant of freezing conditions and will hibernate below the frost line during cold periods. In British Columbia, they typically hibernate between November and March, although they have been observed basking on warm days in the middle of winter.

Reproduction

Common Wall Lizards are oviparous and can lay eggs multiple times per year. Mating occurs quickly after they emerge from hibernation. About one month after, females will lay anywhere from 3-11 eggs. If it is a particularly sunny/warm year and females are in good condition, they may lay up to two more clutches before the summer ends. The female will either bury the eggs underground, or place them under a rock or piece of bark, where the eggs will incubate for about a month before hatching.

Diet

Common Wall Lizards mostly eat ground and flying insects like beetles, flies, and spiders. They are very quick predators, and specialize in catching flying insects by making tremendous leaps into the air. If a Wall Lizard catches a large insect, they will bite it firmly and thrash their head back and forth until it stops moving. Wall Lizards have also been observed eating fruit and berries.

Conservation Status

Global: G5 (1999)

Provincial: SNA (2018)

BC List: Exotic

Learn more about conservation status rankings here

Threats

The Common Wall Lizard is a ground-dwelling species that prefers open, exposed sites with cover objects Common Wall Lizards are an introduced species that has the potential to become an invasive species in B.C. based on population traits seen in other native and introduced populations. As such, there is no conservation concern for existing populations of Wall Lizards, but rather concern for how they may impact native species. In some areas, Wall Lizards overlap with populations of Northern Alligator Lizards, where they have been seen basking in the same spots and are suspected to hibernate in the same locations. Little is known about how Wall Lizards may be impacting Northern Alligator Lizards, however, since they share the same habitat and food sources, there is high potential for competition. You can help to monitor Common Wall Lizards on Vancouver Island by reporting sightings to the Ministry of Environment. The Common Wall Lizard is here to stay in British Columbia, but there are ways you can help to mitigate the spread and impact of this introduced species. Wall Lizards can populate new areas with the help of transport from farm vehicles, plants, and food, as well as from humans releasing pet Wall Lizards. If you have Wall Lizards on your property or live near an area that Wall Lizards have populated, carefully ensure that you are not transporting them when visiting other areas. If you see a Common Wall Lizard, report it to the Invasive Species Council of British Columbia.

Did You Know?

European Wall Lizards do very well in warmer temperatures. They are adapted to the subtropical climate of southern Italy, meaning they may fare well in British Columbia as temperatures increase as a result of climate change.

Species Account Author: Marcus Atkins

References

B.C. Conservation Data Centre. 1993. Species Summary: Podarcis muralis. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed May 31, 2021). 
B.C. Conservation Data Centre. 2021. BC Species and Ecosystems Explorer. B.C. Minist. of Environ. Victoria, B.C. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed May 31, 2021). 
http://linnet.geog.ubc.ca/efauna/Atlas/Atlas.aspx?sciname=Podarcis%20muralis 
https://www.bcreptiles.ca/lizards/eurowall.htm