Which interior regions form the core summer residency range for Costa's Hummingbirds?
Answer
Interior regions of Southern California, lower deserts of Nevada, and Southern Utah
The core distribution where Costa's Hummingbirds are common during the breeding season is strictly confined to the hot, dry interior regions of the American Southwest. This area encompasses the interior regions of Southern California, the lower deserts covering much of Nevada, and significant portions of Southern Utah. Importantly, this range often excludes the immediate coastal areas near the Pacific. When looking at distribution maps, their population density drops off sharply at the edges of this limited, specialized biome, confining them to these specific arid zones for summer residency.
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