Pumas are protecting human lives by preventing vehicle collisions accounting for a 76% reduction in accidents

The presence of pumas, also known as cougars or mountain lions, in Washington state is significantly enhancing road safety by reducing deer-vehicle collisions by 76%. A study published in 'Current Biology' found that these large predators are indirectly protecting human lives by altering the behavior of the local deer population.

Researchers observed that in areas where pumas are active, deer are 15% less likely to be found near roadways. Instead, they are choosing to spend more time in remote habitat areas. This change in spatial use, combined with a shift in activity towards daylight hours, has led to a substantial decrease in dangerous nighttime collisions.

"We found that large carnivores can make roadways safer through their effects on prey behaviour and space use," stated Justin Suraci of Conservation Science Partners, the study's lead author. "Deer alter their use of both space and time where pumas are present, overlapping less with roads and reducing activity at night, when some of the most dangerous collisions occur. Increased road safety thus represents an ecosystem service that large predators like pumas can provide to human communities."

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We found that large carnivores can make roadways safer through their effects on prey behaviour and space use. Deer alter their use of both space and time where pumas are present, overlapping less with roads and reducing activity at night, when some of the most dangerous collisions occur. Increased road safety thus represents an ecosystem service that large predators like pumas can provide to human communities.

Annually in the USA, an estimated 1.5 to 2.1 million deer-vehicle collisions occur, resulting in significant human injuries and fatalities, along with billions of dollars in property damage. The study highlights the often-overlooked benefits of coexisting with large carnivores.

"When we talk about pumas, we often focus on the risks they pose. But we rarely stop to consider the many ways they benefit us as well," said Mark Elbroch of Panthera. "Living alongside large carnivores isn’t simply about protecting wildlife; it’s about protecting the many ways they quietly benefit us every day."

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When we talk about pumas, we often focus on the risks they pose. But we rarely stop to consider the many ways they benefit us as well. Living alongside large carnivores isn’t simply about protecting wildlife; it’s about protecting the many ways they quietly benefit us every day.