Idaho Fish and Game Reassures Public About Moose Tick Infestations

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Idaho Fish and Game is advising the public that moose appearing patchy or unhealthy this time of year are often experiencing a normal seasonal condition caused by winter ticks, not disease. The agency says reports have increased in North Idaho of moose with hair loss or 'mange-like' appearances, but this is a natural part of the ecosystem and there is currently no way for wildlife managers to control tick numbers on individual animals or in the environment.

Why it matters

Shorter winters in recent years have likely allowed more ticks to survive, making the issue more noticeable. While adult moose can generally tolerate heavy tick loads, calves are more vulnerable and may suffer from blood loss and reduced body condition. Fish and Game is reminding residents to keep their distance from moose to avoid potential aggression, especially from cows with calves.

The details

As moose attempt to relieve irritation from the ticks, they scratch and rub against trees and brush, causing clumps of hair to fall out and leaving visible bald patches. While the condition can look severe, it is a natural part of the ecosystem, according to Fish and Game. The agency noted they may intervene if public safety is at risk from moose moving through populated areas.

• Winter ticks attach to moose in large numbers beginning in the fall.
• The ticks become more noticeable through the winter months.