In 2020, Arizona Field Ornithologists (AZFO) launched a project to fill in the gaps of underbirded areas in Arizona. Progress was made in 4 of the 5 areas, particularly the Avra Valley and Cactus Forest areas, between 1 December 2023 and 31 December 2024,

Two firgures looking at birds in a desert landscape
AZFO participants on Avra Valley field expedition, looking toward Silverbell Mountains. Photo by Dara Vasquez.