Editing Hummingbird (section)

===Population estimates and threatened species===
Although most hummingbird species live in remote habitats where their population numbers are difficult to assess, population studies in the United States and Canada indicate that the ruby-throated hummingbird numbers are around 34 million, rufous hummingbirds are around 19 million, [[black-chinned hummingbird|black-chinned]], [[Anna's hummingbird|Anna's]], and [[broad-tailed hummingbird]]s are about 8 million each, [[calliope hummingbird|calliopes]] at 4 million, and [[Costa's hummingbird|Costa's]] and [[Allen's hummingbird]]s are around 2 million each.<ref name=abc/> Several species exist only in the thousands or hundreds.<ref name=abc/>

According to the [[IUCN Red List|International Union for Conservation of Nature Red List of Threatened Species]] in 2024, 8 hummingbird species are classified as [[critically endangered]], 13 are [[Endangered species|endangered]], 13 are [[vulnerable species|vulnerable]], and 20 species are [[Near-threatened species|near-threatened]].<ref name=iucn/> Two species {{ndash}} the [[Brace's emerald]] (''Riccordia bracei'') and Caribbean emerald (''Riccordia elegans'') {{ndash}} have been declared [[extinction|extinct]].<ref name=iucn/>
[[File:Archilochus colubris (Male).jpg|thumb|left|Male ruby-throated hummingbird (''Archilochus colubris'')]]
Of the 15 species of North American hummingbirds that inhabit the United States and Canada,<ref name=abc/> several have changed their range of distribution, while others showed declines in numbers since the 1970s,<ref name=abc/><ref name=English/> including in 2023 with dozens of hummingbird species in decline. As of the 21st century, rufous, Costa's, calliope, broad-tailed, and Allen's hummingbirds are in significant decline, some losing as much as 67% of their numbers since 1970 at  nearly double the rate of population loss over the previous 50 years.<ref name=abc/><ref name=English/><ref name="cnn">{{cite news |last1=Chillag|first1= Amy |title=These tiny creatures are losing their battle to survive. Here's what we can do to save them |url=https://www.cnn.com/2023/04/21/world/iyw-rufous-hummingbird-tipping-point-extinction-earth-da |access-date=22 April 2023 |work=CNN |date=21 April 2023}}</ref> The ruby-throated hummingbird population {{ndash}} the most populous North American hummingbird {{ndash}} decreased by 17% over the early 21st century.<ref name=English/> Habitat loss, glass collisions, cat predation, [[pesticide]]s, and possibly [[climate change]] affecting food availability, migration signals, and breeding are factors that may contribute to declining hummingbird numbers.<ref name=abc/><ref name=cnn/> By contrast, Anna's hummingbirds had large population growth at an accelerating rate since 2010,<ref name=English/> and expanded their range northward to reside year-round in cold winter climates.<ref name=greig/>