For some blind and visually impaired persons birding by ear has become a lifelong passion. Their ranks are swelling, and birding trails in Arizona and elsewhere are undergoing changes to become more accessible to visually impaired and otherwise disabled birders. Bird of the week: Hepatic Tanager. Birding hotspot: Gillespie Wash in Graham County. Friend of wildlife organization: Arizona Association of Environmental Professionals. Calendar of bird-friendly events coming up across Arizona.