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Increased urbanization and supplementary feeding are implicated in driving the expansion of the range of the Anna’s Hummingbird (Calypte anna). In many areas this range expansion has been well described, but the recent expansion of the northeastern limit of the nonbreeding distribution, in winter in Idaho, has not yet been summarized. Using data fr...
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Context 1
... efforts at banding and color-marking took place largely in Boise, opportunistically at other locations across Idaho (Table 1). After our call for sightings, we responded to homeowners' reports of hummingbirds visiting regularly from October to February and requested permission to band and color-mark them whenever possible. ...Context 2
... most frequent in late fall/winter (October-February), reports through eBird now encompass every month of the year (March-September 2006-2014, mean 2.3, range 1-7 annually; 2015-2020, mean 13.5, range 10-23 annually). Combined data from the IBRC database and eBird illustrate a sharp Female M07790 1 - Hayden 15 Jan 2016 Adult Male K31204 - - Hayden 27 Dec 2018 Adult Female K31931 3 5.1 Heyburn 22 Nov 2015 Juvenile Male K31203 1 5.1 Inkom 11 Oct 2017 Juvenile Female K95455 2 4.6 New Meadows 10 Nov 2018 Adult Male K47034 3 5.3 Twin Falls 29 Nov 2015 Adult Male J98802 3 5 a T, trace; 1, less than ⅓ in interfurcular space; 2, ⅓ to ⅔ fat in interfurcular space; 3, interfurcular space full b Symmetric molt in primaries, primary 9 most recently grown, rectrices all growing in concurrently. c Symmetric molt in primaries, primary 7 most recently grown, tail finished recent molt. ...Context 3
... Tail in symmetric molt, rectrix 2 on both sides growing. Table 1 (continued). increase since 2011 in both the spatial distribution and numbers of Anna's Hummingbirds wintering in Idaho (Figure 2). ...Context 4
... November 2015, associates of the Intermountain Bird Observatory and banding colleague Francine Rudeen have banded and color-marked 58 individual Anna's Hummingbirds across Idaho (Table 1). The majority were in the southwestern part of the state, but some were as far north as Coeur d' Alene, Kootenai County, in the panhandle and as far east as Inkom, Bannock County, in the southeast (Table 1). ...Context 5
... November 2015, associates of the Intermountain Bird Observatory and banding colleague Francine Rudeen have banded and color-marked 58 individual Anna's Hummingbirds across Idaho (Table 1). The majority were in the southwestern part of the state, but some were as far north as Coeur d' Alene, Kootenai County, in the panhandle and as far east as Inkom, Bannock County, in the southeast (Table 1). ...Context 6
... color-marking and resighting, we identified more individuals at most banding locations than had been reported previously from observations at feeders alone. For example, over a 2.5-week span in November 2015, we identified six different individuals at one location in Boise, when the homeowner's observations alone, based on the distinct ages and sexes present, suggested only three birds (Table 1). In the most extreme example, on a single morning on 21 November 2016, at a different home in Boise, we banded and color-marked seven birds and observed two additional distinct, unmarked birds for a minimum of nine at one location, when the homeowner's observations alone suggested just two or three birds (Table 1). ...Context 7
... example, over a 2.5-week span in November 2015, we identified six different individuals at one location in Boise, when the homeowner's observations alone, based on the distinct ages and sexes present, suggested only three birds (Table 1). In the most extreme example, on a single morning on 21 November 2016, at a different home in Boise, we banded and color-marked seven birds and observed two additional distinct, unmarked birds for a minimum of nine at one location, when the homeowner's observations alone suggested just two or three birds (Table 1). ...Context 8
... banding data indicate that the majority of birds captured in Idaho are adults (Figure 3). Of the 58 individuals captured, 22 were adult males (38%), 20 were adult females (34%), 8 were juvenile males (14%), and 7 were juvenile females (12%) (Figure 3; Table 1). Following Wells et al. (1996) and Pyle (2001;see also Howell 2003), we conservatively aged one female as unknown, as its plumage and bill-corrugation characteristics conflicted. ...Context 9
... efforts at banding and color-marking took place largely in Boise, opportunistically at other locations across Idaho (Table 1). After our call for sightings, we responded to homeowners' reports of hummingbirds visiting regularly from October to February and requested permission to band and color-mark them whenever possible. ...Context 10
... most frequent in late fall/winter (October-February), reports through eBird now encompass every month of the year (March-September 2006-2014, mean 2.3, range 1-7 annually; 2015-2020, mean 13.5, range 10-23 annually). Combined data from the IBRC database and eBird illustrate a sharp Female M07790 1 - Hayden 15 Jan 2016 Adult Male K31204 - - Hayden 27 Dec 2018 Adult Female K31931 3 5.1 Heyburn 22 Nov 2015 Juvenile Male K31203 1 5.1 Inkom 11 Oct 2017 Juvenile Female K95455 2 4.6 New Meadows 10 Nov 2018 Adult Male K47034 3 5.3 Twin Falls 29 Nov 2015 Adult Male J98802 3 5 a T, trace; 1, less than ⅓ in interfurcular space; 2, ⅓ to ⅔ fat in interfurcular space; 3, interfurcular space full b Symmetric molt in primaries, primary 9 most recently grown, rectrices all growing in concurrently. c Symmetric molt in primaries, primary 7 most recently grown, tail finished recent molt. ...Context 11
... Tail in symmetric molt, rectrix 2 on both sides growing. Table 1 (continued). increase since 2011 in both the spatial distribution and numbers of Anna's Hummingbirds wintering in Idaho (Figure 2). ...Context 12
... November 2015, associates of the Intermountain Bird Observatory and banding colleague Francine Rudeen have banded and color-marked 58 individual Anna's Hummingbirds across Idaho (Table 1). The majority were in the southwestern part of the state, but some were as far north as Coeur d' Alene, Kootenai County, in the panhandle and as far east as Inkom, Bannock County, in the southeast (Table 1). ...Context 13
... November 2015, associates of the Intermountain Bird Observatory and banding colleague Francine Rudeen have banded and color-marked 58 individual Anna's Hummingbirds across Idaho (Table 1). The majority were in the southwestern part of the state, but some were as far north as Coeur d' Alene, Kootenai County, in the panhandle and as far east as Inkom, Bannock County, in the southeast (Table 1). ...Context 14
... color-marking and resighting, we identified more individuals at most banding locations than had been reported previously from observations at feeders alone. For example, over a 2.5-week span in November 2015, we identified six different individuals at one location in Boise, when the homeowner's observations alone, based on the distinct ages and sexes present, suggested only three birds (Table 1). In the most extreme example, on a single morning on 21 November 2016, at a different home in Boise, we banded and color-marked seven birds and observed two additional distinct, unmarked birds for a minimum of nine at one location, when the homeowner's observations alone suggested just two or three birds (Table 1). ...Context 15
... example, over a 2.5-week span in November 2015, we identified six different individuals at one location in Boise, when the homeowner's observations alone, based on the distinct ages and sexes present, suggested only three birds (Table 1). In the most extreme example, on a single morning on 21 November 2016, at a different home in Boise, we banded and color-marked seven birds and observed two additional distinct, unmarked birds for a minimum of nine at one location, when the homeowner's observations alone suggested just two or three birds (Table 1). ...Context 16
... banding data indicate that the majority of birds captured in Idaho are adults (Figure 3). Of the 58 individuals captured, 22 were adult males (38%), 20 were adult females (34%), 8 were juvenile males (14%), and 7 were juvenile females (12%) (Figure 3; Table 1). Following Wells et al. (1996) and Pyle (2001;see also Howell 2003), we conservatively aged one female as unknown, as its plumage and bill-corrugation characteristics conflicted. ...Citations
... This first documented successful breeding of the Anna's Hummingbird in Idaho provides a marker on the chronology of the species' range expansion into the state. This chronology has thus far been well documented through the methods outlined by Pollock et al. (2021). Continued focus and documentation of the increase in numbers, as well as of further instances of breeding, will provide fine-scale details to the ongoing range expansion experienced by this species since the urbanization of the West accelerated in the middle of the 20th century. ...
