In 2020, AZFO began a new project, the eBird Gaps Project, to supplement the knowledge gained by the 1-to-2-day expeditions. The locations of all eBird checklists for the state (eBird 2020) were reviewed, and 5 general areas were selected that showed significant gaps in coverage (eBird 2020). These gaps were defined as few or no reports in any season or the absence of reports for particular seasons. The areas are Avra Valley (Pima/Pinal counties), Cactus Forest (Pinal County), Chavez Pass (Coconino County), Hassayampa Plain (Maricopa County), and Santa Maria Mountains (Yavapai County). This report summarizes what has been learned in the past 3 years and what steps are needed to continue to fill in these gaps.