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Massasauga Rattlesnake

Sistrurus catenatus catenatus

It is the only venomous snake species in Ontario, and although its venom is potent, this is a small snake with small fangs and a limited amount of venom. Snake bites are rare; approximately 2-3 per year and with treatment, a full recovery is highly probable.

If you see or hear a rattlesnake, simply leave it alone! If you give the snake room it will retreat.

COSEWIC Status: Threatened

COSSARO Status: Threatened

Committee on the Status of Endangered Wildlife in Canada

The committee on the Status of Endangered Wildlife in Canada is a committee of experts who determine the national status of native species thought to be at risk of disappearing from Canada. Members include academics, specialists, Aboriginal people or government, & biologists.

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Species at Risk Status

Threatened

This species is likely to become endangered if limiting factors are not reversed.

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Committee on the Status of Species at Risk in Ontario

The committee on the Status of Species at Risk in Ontario reviews the COSEWIC status reports for species that occur in Ontario, then makes recommendations on the appropriate provincial status of the species. Provincial status is identified on the Ministry of the Environment, Conservation and Parks Species at Risk in Ontario (SARO) List.

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Species at Risk Status

Threatened

This species is likely to become endangered if limiting factors are not reversed.

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Have you seen this species at risk? Report your sighting.

Food

• Small mammals including voles, mice and shrews.

Habits and Reproduction

• Hibernates below the frost line from October to mid-April. A rock fracture, root pocket or rodent burrow provides a suitable site. In eastern Georgian Bay, these sites are often associated with damp areas or wetlands.
• Emerge from hibernation in late April.
• Uses venom to subdue prey.
• Shy, secretive, non-aggressive snake. Relies on camouflage and remaining still to avoid predators.
• Heat sensitive pits on head allow it to sense warmth in the vicinity while hunting under the cover of darkness.
• They reach sexual maturity at age 4 or 5 and mate mid to late summer.
• A female may reproduce every 2nd or 3rd year. Pregnant females will seek out “gestation” sites. These sites provide safe cover and a good range of temperatures so they can incubate their young. In our area, “table” rocks are often the preferred sites and a female will return to the same site each time she is pregnant.
• The average litter is 12, and the young are born usually in August.
• Newborns are 20-25 cm long and similar to adults but lighter in background colour. Their rattle is yellowish in colour. The fangs and venom are present at birth.

Habitat

• Found in rocky scrub habitat, damp lowlands, open woodlands, bogs, and fens.

Threats

• Habitat loss particularly of important habitat such as hibernation sites, road mortality and direct persecution are the greatest threats to this snake.

Conservation Actions

• For more information on how to prevent and treat rattlesnake bites –Snake Saftey Tips. 
• Guidelines for identifying important Massasauga Rattlesnake habitat are available at Parry Sound OMECP.
• Safety note regarding the use of silt cloth.
• How to safely move a rattlesnake.

Do You Work Outdoors?

• A “Working in Massasauga Habitat” DVD is available. Please contact us for a copy.