Bulletins

Waterton Lakes National Park

Warning: Aggressive Deer

Issued: June 04, 2026

Ends: July 20, 2026

A substantial deer population lives in the community of Waterton year round, because it provides a relatively safe haven from predators and an attractive source of food.

These deer are habituated to the presence of humans and have lost their natural wariness of humans. Although the deer look cute and harmless, they can be aggressive, especially to people and dogs. 

The females (does) are of particular concern during the spring fawning season (June and early July). They aggressively defend their fawns when people, especially those walking their dogs, come anywhere near, and this aggression is escalating.

For your safety and for the safety of the deer, maintain a good distance from the animals while watching them, and do not entice or feed them. Be particularly cautious when walking your dog!

Reporting an incident
Please report any instances of aggressive behaviour by deer, deer attacks and/or injuries due to an attack by calling 1-888-927-3367. If possible, take a picture of the animal involved.

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