Where do Costa's Hummingbird sightings become noteworthy and arguably rare?
Answer
Once they venture beyond southeastern California, southern Nevada, Arizona, and Utah boundaries
The perception of rarity for the Costa's Hummingbird is intrinsically linked to geography. Within its specialized and restricted core range—which encompasses parts of southeastern California, southern Nevada, southern Arizona, and southwestern Utah—the bird is a relatively common sight during the breeding season. However, the moment this species moves outside these established geographic and seasonal boundaries, such as being spotted in locations like the Willamette Valley of Oregon, the sighting immediately becomes noteworthy, significant, and is considered rare because the bird is far outside its expected distribution pattern.
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