Above is the first panel of a one-page comic titled "Strange Tales of the Pacific Northwest. Episode 34: 20,000 Legs Under the Trees", drawn by Lukas Ketner and written by Ryan Brown. The rest of the comic is an exciting, action-packed tale of peaceful tree octopuses forced to roll up their tentacles to defend themselves from a hungry cougar.
It was published inside the cover of an Oregonian magazine or some sort of periodical. I'm still trying to track down the details. The email address I have for Ketner returned a "no such user" error, so if you know him or Brown, please let them know I'm looking for them. In the meantime, if someone knows more about exactly where and when this was published (or would like to get me a physical copy), please email me. I'll update this post if I learn more.
Update 2007-10-30: The publication is The Bear Deluxe Magazine, issue #25, published by Orlo, a "nonprofit organization using the creative arts to explore environmental issues" based in Oregon.