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Table 1.

Mean morphological and kinematic values for Selasphorus hummingbirds in the Colorado Rocky Mountains

GenderElevationm (g)R (mm)n (Hz)Φ (degrees)WDL (g m-2)
S. platycercus       
    Females 1875 3.375 56.398 34.078 146.431 0.042 
 2900 3.592 57.790 37.669 151.742 0.041 
    Males 1875 3.332 54.816 37.181 149.348 0.043 
 2900 3.360 54.355 37.890 151.999 0.043 
S. rufus       
    Females 1875 3.331 45.238 44.747 144.998 0.065 
 2900 3.800 47.711 47.623 161.085 0.060 
    Males 1875 3.404 42.754 54.066 163.893 0.066 
 2900 3.601 42.496 55.563 167.573 0.071 
GenderElevationm (g)R (mm)n (Hz)Φ (degrees)WDL (g m-2)
S. platycercus       
    Females 1875 3.375 56.398 34.078 146.431 0.042 
 2900 3.592 57.790 37.669 151.742 0.041 
    Males 1875 3.332 54.816 37.181 149.348 0.043 
 2900 3.360 54.355 37.890 151.999 0.043 
S. rufus       
    Females 1875 3.331 45.238 44.747 144.998 0.065 
 2900 3.800 47.711 47.623 161.085 0.060 
    Males 1875 3.404 42.754 54.066 163.893 0.066 
 2900 3.601 42.496 55.563 167.573 0.071 

Stroke amplitude (Φ) and wingbeat frequency (n) were measured during free flight at each site

Body mass (m), wing length (R), and Φ were used to calculate the wing disc loading, WDL

Free-flight wingbeat kinematics were attained for S. platycercusfemales although these birds were not included in flight trials

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