Known predators include arctic ground squirrels and short tailed weasels which are most prevalent during the breeding season. Since nests are on the ground, Harris's sparrows provide an easy target for these terrestrial predators. Otherwise, northern shrikes and merlins are their main predators.
As an anti-predator adaptation, Harris's sparrows fly up into trees when startled by humans. They duck down to the ground when threatened by other birds. They also produce alarm calls when threatened to alert others.
- Arctic ground squirrels (Spermophilus parryii)
- Short tailed weasels (Mustela erminea)
- Northern shrikes (Lanius excubitor)
- Merlins (Falco columbarius)
Anti-predator Adaptations: cryptic