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Squirrels: They're No Nuts!

The uncommon life of a common animal

All Animals magazine, November/December 2015

by Nancy Lawson

Squirrels are nature's ultimate gardeners. Photo by Doug4537/iStockphoto

In 1749, Pennsylvania put a bounty on Eastern gray squirrels—threepence per scalp. Their crime? Eating too much corn. It wasn’t the first time humans waged war on the bushy-tailed rodents: Massachusetts had already offered fourpence.

A century later, cities along the Eastern seaboard began releasing gray squirrels into urban centers for the enjoyment of local residents, even supplying nest boxes and community-stocked feeders. Treated more like outdoor pets than wild animals, squirrels were also transported far from their native stomping grounds to cities like Seattle and London, where Eastern grays are now blamed for marginalizing other species.

A microcosm of our contradictory relationships with animals, human-squirrel interactions have long been shortsighted. Caught between unbridled admiration by those who delight in their acrobatic ways and relentless persecution by others intent on “doing battle” with them, common tree squirrel species are sometimes subjected to draconian treatment. Though the scene of perceived seed-stealing crimes is more likely to be a birdfeeder these days than an agricultural field, the measures are still drastic; one of my friend’s relatives shoots squirrels to guard the feast he’s laid out for songbirds.

Humans can be cruel and irrational, especially when the motivation is revenge. John Griffin, director of urban wildlife solutions at The HSUS, has seen his share of squirrels left to die after homeowners set traps and never looked back. “There’s a real disconnection from nature that exacerbates the problem,” says Griffin. His team runs Humane Wildlife Services, which humanely evicts animals from attics, chimneys and other structures. “If you have an animal who’s a nuisance or in your house, typically it’s framed as, ‘This animal is targeting me in some way, I’ve got to solve it; I’ve got to solve it on an emergency basis’—without really understanding what’s going on.”

  • Humane Wildlife Services makes sure to keep squirrel families together when performing evictions. Photo by Lori Thiele/The HSUS

Making a House a Home

Griffin and his colleagues can often intercede before clients act on those instincts. They explain that a squirrel in the attic is likely a mother seeking a safe space to raise her young. They determine where the animals entered. They remove babies, place them in a box nearby, install a one-way door and wait for the mother to move her family. Once everyone’s out, the team seals entry points to prevent recurrence. When the call for help comes too late, HWS is left to pick up the pieces of botched jobs: In one case, the team arrived to find an illegal body-crushing trap clamped down on a squirrel who just happened to be walking by. Beyond the obvious cruelty, such approaches don’t solve the problem. All too commonly, HWS arrives at a job to find a series of live traps set on a roof and the squirrel family still cozily ensconced in the attic.

Failure to consider animal behavior or repair structural damage creates open invitations for wildlife. Squirrels’ ingenuity knows few boundaries, and their maternal instincts are so strong they’ve been known to fight off dogs and, on rare occasions, chew through metal to get to their young. They can scale walls and squeeze through 2-inch holes. “There’s no difference to a squirrel in terms of what’s natural and what’s human-built,” says Griffin. “They’re like a house can opener.”

Stocking the Pantry

Anyone dismayed by squirrelly birdfeeder antics will recognize that description. But understanding more about what Wilkes University professor Michael Steele has called their “high-maintenance lifestyle” may garner sympathies of even the most frustrated squirrel detractor.

How ironic is it that animals who help birds far more than any birdfeeder could are the object of such angst among birdwatchers and gardeners?

Unlike other squirrel species, tree squirrels don’t hibernate and must regulate food supplies all year. Research by Steele and others has documented their ability to decide which seeds are better eaten immediately and which ones can be stored. They can even keep fast-germinating white oak acorns from sprouting by excising embryos before burying the seeds. They remember cache sites, monitoring and relocating food throughout the season.

“One of the big misconceptions is that their behavior just seems so random, that they’re just out there popping around,” says Steele. “And the thing [people] have to realize is that just about every minute of every day is a careful behavioral decision that they’re making in order to survive.”

Eastern gray squirrels even engage in “deceptive caching,” digging a hole and pretending to bury a seed they keep in their mouths. “That actually meets the criteria of tactical deception,” says Steele, “which was generally only thought to occur in primates.”

While creating their food caches, squirrels plant trees that feed hundreds of species. Many of those species in turn sustain others; oak trees alone support more caterpillars, the mainstay of most terrestrial baby birds’ diets, than anything else in the forest. “We suggest that the importance of tree squirrels in some biomes or ecosystems may be significant enough to elevate them to the status of keystone species,” write Steele and co-author John Koprowski in their book, North American Tree Squirrels.

The Gifts They Bring

Our backyard squirrels, then, are nature’s ultimate gardeners, returning to earth the seeds of wildlife-sustaining plants that we humans cut down. How ironic is it that animals who help birds far more than any birdfeeder could are the object of such angst among birdwatchers and gardeners? How much more fulfilling would our relationship with other species be if we remembered they all have a place in the landscape?

Even when growing food, we don’t have to issue a bounty on squirrel heads to protect our gardens. Rock squirrels and tree squirrels have made themselves at home on Tammi Hartung’s Colorado farm, eating birdseed and chewing through irrigation system emitters. Rather than chastise the squirrels, Hartung lets them join the feast and plants hedgerows rich in food for wildlife. Realizing the squirrels are thirsty, she places saucers of fresh water near drip lines. A hot pepper-petroleum jelly mixture slathered around emitters offers extra insurance.

Her methods are successful because she avoids jumping to conclusions, says Hartung, the author of The Wildlife-Friendly Vegetable Gardener. “Just sit for a little while and pay attention to what’s actually going on,” she advises. “Then you can figure out a better way to handle it.”

Through closer observation on my own land, I’ve learned that squirrels and other animals bring more gifts than they take away. We just have to be willing to accept them. Last spring, a friend suggested I remove the oaks, hickories and walnuts popping up in my grass and wildflower areas. Years ago, I probably would have. But now I’ve ceded some landscaping work to nature’s real gardeners, who, if only we’d let them, could eventually plant enough seeds, berries and nuts to feed us all.

Follow Nancy Lawson on her blog at humanegardener.com and on Twitter: @humanegardener.


Protecting Your Own Nest

It's easier to prevent squirrel entry than to perform evictions. Limit roof damage by keeping branches at least 6 feet away, recommends HSUS urban wildlife solutions director John Griffin. Cover attic side vents and seal holes at roofline intersections. Just be sure to check for animals first; if a family is inside, wait for them to leave or consult with a humane wildlife company. Avoid those that claim to humanely relocate squirrels, a method that often separates families and leaves dependent young behind. Adults also suffer a cruel fate: relocation even a short distance away is often deadly for squirrels and other animals, who may have more trouble competing for resources with their own kind and avoiding predation from others in unfamiliar territories. Get more tips on coexisting with squirrels »
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