Seeing more wildlife in your yard? Climate change may explain why, UCLA study finds

If you’ve noticed more wildlife visiting your yard in recent years — maybe digging up your vegetable garden or even drinking from your pool — you’re not alone.

A recent study from UCLA found that larger predators like mountain lions and bears are more likely to interact with humans and travel closer to population centers in drier years. To determine this, the researchers analyzed state data collected on reported property damage, nuisances, conflicts and sightings.

“It kind of runs the full gamut of how people interact with wildlife around their neighborhoods and their homes,” said UCLA postdoctoral researcher Kendall Calhoun, the lead author on the study.

It's not just P-22. Mountain lions across the whole state are forced to leave their habitats for survival.

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Courtesy Kendall Calhoun

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Different motivations for different animals

As you might expect, different animals might have different reasons for entering populated areas. But in large part, Calhoun said, it comes down to animals’ survival instincts.

The primary motivator for many herbivores is likely to be food. That’s because with less precipitation, there’s also less plant material for them to eat. (Don’t forget: even with all the rain we’ve had recently, much of Southern California is still in a drought.)

“ Deer and elk might be pushed to find those food resources in places that they normally wouldn't go, like agriculture, crops, things from people's yards, persimmons from your tree,” Calhoun said.

And as herbivores get pushed toward humans, the animals that prey on them follow. In fact, the species that saw the highest increases in clashes with humans were omnivores and carnivores, specifically mountain lions, coyotes, black bears and bobcats.

But even these animals have varying reasons for getting close to people.

“Mountain lions might be more inclined to look for supplemental food in livestock — that might be a sheep or a goat,” Calhoun said. “Black bears may be more willing to go into your trash to look for food to help supplement what they're missing in their resource-scarce natural areas.”

Meanwhile, animals of all kinds might enter a yard even when they have enough food to look for standing water.

About the data

Researchers analyzed data from the California Department of Fish and Wildlife that were reported over the last several years as part of a citizen science initiative.

One important caveat is that the researchers primarily looked at conflicts between wildlife and residents, and there may be differences in how these interactions are reported.

For example, you might not report a deer eating fruit from an overloaded tree as a nuisance, but even a peaceful black bear digging through your trash could raise alarm bells.

 "People also really value having wildlife living alongside them," Calhoun said. "It really is important for us to try to strike that balance where there's pros for both sides, without some of the negative interactions that come with living in close proximity with wildlife species."

Learn more about human-wildlife interactions

There’s more background on the research on UCLA’s website, and you can find the full study here.

You can also learn much more about interactions between humans and wildlife in LAist’s Imperfect Paradise podcast series, “Lions, Coyotes, & Bears.”