Four years ago, Melody Murray started noticing these cute signs in her Portland, Oregon neighborhood of Sullivan’s Gulch. Posted in residents’ front yards, the signs read: “Certified Backyard Habitat” with a drawing of a black, red and white spotted towhee sitting on a leafy branch.

“I didn’t know what they were for,” says the Ohio native who moved to Oregon in 1994. Her curiosity piqued, she went online and quickly found out: The Backyard Habitat Certification began as a joint project of Columbia Land Trust and Portland Audubon (now called the Bird Alliance of Oregon) to encourage urban residents to garden without pesticides, plant native plants and remove invasive species. All of these practices support a flourishing community of native birds, insects and other wildlife.