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Mountain lions may cut deer-vehicle crashes on Washington’s Olympic Peninsula

A Current Biology study found pumas may alter deer movements on Washington’s Olympic Peninsula, helping lower the number of deer-vehicle collisions.

Published Aug 9, 2026, 6:00 AM EDT | LehighValleyLive

Mountain lions may be doing more than maintaining healthy ecosystems. A new study suggests the large predators are also helping reduce vehicle crashes by influencing where and when deer move across parts of Washington state. Researchers found that areas with a stronger puma presence experienced significantly fewer deer-vehicle collisions than areas where the animals were less common, phys.org reported.