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This author seems perplexed but Anna's Hummingbirds are rather common cold weather visitors to feeders  in the Pacific Northwest https://www.spokesman.com/stories/2021/dec/25/unusual-annas-hummingbird-sightings-have-local-bir/ See our info on How to Feed Hummingbirds in Cold Weather

Ashley Y. Kim · David T. Rankin · Erin E. Wilson Rankin Abstract Hummingbirds utilize visual cues to locate flowers, but little is known about the role olfaction plays in nectar foraging despite observations that hummingbirds avoid resources occupied by certain insects. We investigated the behavioral responses of both wild and captive hummingbirds to olfactory cues of hymenopteran floral visitors, including native wood ants (Formica francoeuri), invasive Argentine ants (Linepithema humile), and European honeybees (Apis mellifera). We demonstrate for the first time that hummingbirds use olfaction to make foraging decisions when presented with insect-derived chemical cues under field and aviary conditions. Both wild and captive hummingbirds avoided...

Theodore H. Fleming,*, Scott Richardson, and Emily H. Scobie University of Miami, Coral Gables, FL 33124, USA (THF) U.S. Fish and Wildlife Service, Arizona Ecological Services Office, 201 North Bonita Avenue, Suite 141, Tucson, AZ 85745, USA (SR) Arizona Game and Fish Department, 5000 W. Carefree Highway, Phoenix, AZ 85086, USA (EHS) * Correspondent: tedfleming@dakotacom.net We report the results of an 11-year (2008–2018) community science project (also known as citizen science) designed to document the use of hummingbird feeders by two species of nectar-feeding bats, the lesser longnosed bat (Leptonycteris yerbabuenae) and the Mexican long-tongued bat (Choeronycteris mexicana), in the Tucson area of southern Arizona....

Jay J. Falk. Michael S. Webster, Dustin R. RubensteinPublished: August 26, 2021 DOI:https://doi.org/10.1016/j.cub.2021.07.043 Highlights Female white-necked jacobins are polymorphic—30% have male-like plumage All juveniles have male-like plumage, excluding sexual selection as an explanation Male-like females receive less con- and heterospecific social harassment Thus, male-like ornamentation in females can arise purely through non-sexual means

For several years, the Hummingbird Monitoring Network (HMN) focused its efforts on monitoring and studying hummingbird populations to obtain important information that supports conservation of these magnificent creatures. Hummingbird Conservation Networks (HCNs) is the result of integrating community-based conservation ideas into HMN’s science-based beginning. HCNs’ mission, essentially unchanged from HMN’s original mission, is to help hummingbirds survive, reproduce, and thrive while engaging human communities to demonstrate how they can benefit economically, socially, and ecologically through their hummingbird conservation activities. Maintaining hummingbird diversity and abundance throughout the Americas is still a primary focus of the organization. Their Website https://www.savehummingbirds.org/ Their Monitoring...