Why do deer avoid roadsides when mountain lions are near?

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Deer avoid roadsides when mountain lions are present due to fear, which reduces collisions.

Deer exhibit avoidance behaviours, such as staying away from roadsides and developed areas, when mountain lions are in the vicinity. This fear-driven behaviour also leads to a reduction in deer activity during nighttime hours. Consequently, in areas with a significant mountain lion presence, such as on Washington state’s Olympic Peninsula, there has been a notable decrease in vehicle collisions involving deer, with figures dropping by up to 76 percent.
Fear-Induced Avoidance Behaviour

The primary driver for deer avoiding roadsides and developed areas is the fear instilled by the proximity of mountain lions. This behavioural change is not directly linked to a reduction in the deer population through predation but rather to the perceived threat posed by these large carnivores.
Reduced Nighttime Activity

In addition to avoiding specific locations, deer also alter their activity patterns when mountain lions are near. They significantly reduce their movements and foraging during nighttime hours, a period when they might otherwise be more active.
Lower Incidence of Vehicle Collisions

The direct impact of this fear response is a measurable reduction in accidents. On the Olympic Peninsula in Washington state, areas with a high concentration of mountain lions have seen vehicle collisions with deer decrease by as much as 76 percent. This phenomenon illustrates the indirect ecological benefits that large carnivores can provide in landscapes shared with human populations.

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Why do deer avoid roadsides when mountain lions are near?

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