Anna’s hummingbirds have expanded their range across the Pacific Northwest, with a presence in cities such as Portland, Oregon. Once largely associated with California, the small, colourful birds gradually moved north and established populations in Oregon, Washington and British Columbia. Records show that numbers remained low for decades before rising rapidly from the late 1990s. Today, Portland has an estimated abundance of 2.01 Anna’s hummingbirds per party-hour, placing it alongside cities in northern California. Researchers link the expansion to population growth, introduced plants, ornamental gardens and hummingbird feeders, while climate change may have helped the species colonise some colder areas. Their growing presence also reflects how urban environments can provide suitable resources for adaptable wildlife. Flowering gardens and artificial feeders offer reliable food, while milder winter conditions may reduce the challenges birds face as they establish themselves farther north than their historical range.
Get breaking news anytime, anywhere. Download the TOI app now!
