Broad-billed Hummingbirds (Cynanthus latirostris) are denizens of riparian woodlands that historically nested only in the extreme southwestern United States and Mexico. This species is considered rare and irregular in central Arizona. However, recent observations of summering Broad-billed Hummingbirds from central Arizona have been recorded with regularity on the citizen science database eBird. Using data queried from eBird, I tested whether the Broad-billed Hummingbird had extended its summering (Jun–Aug) range northward in Arizona and compiled the breeding sites and nectar sources used by this species in central Arizona (Gila, Maricopa, and Yavapai counties). A positive correlation between the maximum summering latitude of Broad-billed Hummingbirds in Arizona and the year (1980–2022) indicates that this species has expanded its breeding range northward across the state. From 2009 to 2022 there were a minimum of 7 independent Broad-billed Hummingbird breeding events in the Phoenix Metropolitan Area that could be confirmed from analysis of the eBird database. No confirmed Broad-billed Hummingbird nesting records from Gila or Yavapai counties were documented on eBird, but observations of probable breeding behaviors were recorded in both counties. Collectively, eBird users photographed Broad-billed Hummingbirds foraging on 16 different nectar sources in central Arizona. Each site where Broad-billed Hummingbirds bred in central Arizona contained exotic flowering plants, especially tree tobacco (Nicotiana glauca), and some also had supplemental feeders. Central Arizona should now be considered a regular part of the Broad-billed Hummingbird’s breeding range.

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