Douglas’s squirrel (Image: WDFW)

A few years ago I took a walk at the Arboretum while waiting for my partner to finish an appointment. It was a crisp Fall day and being mid-week and late morning, the many trails were mostly free of pedestrians and I wandered about enjoying some idle time outside. Turning down a small path beneath towering Douglas firs, I stumbled upon a pile of fir cones that had been pulled apart and heaped atop a small log.

I was amazed, because I was almost certain who had created this mess: a Douglas’s Squirrel, Tamiasciurus douglasii.

Finding the sign of a squirrel at an urban park is far from a shocker. Most of us go through our day to day seeing and summarily ignoring most of the Eastern Gray Squirrels, Sciurus carolinensis, we encounter (except for the ones that gulp down our bird seed). However, Douglas’s Squirrel was not expected. At the time, I was certain they only existed in small pockets of mature(ish) coniferous forest in Seattle, like Discovery or Seward Park. But here was nearly irrefutable proof, a telltale sign I’d come to recognize from decades of hiking and naturalizing across Western Washington.

Douglas’s Squirrels are diminutive, brown and rusty red colored, and by far the most common tree squirrel west of the Cascades in Washington. Being rodents, it should be no surprise to find one cropping up unbidden and unnoticed (and I wouldn’t blame anyone if they didn’t share my immediate enthusiasm for this). That’s exactly how Eastern Gray Squirrels have shown up across the US. They hitch a ride or are accidentally transplanted. Eastern Gray Squirrels may be introduced, but they have thrived in our cityscapes, finding plantings of street trees offering them the nuts and acorns of their native ranges and bountiful other food sources for their flexible, omnivorous diets. Continue reading →