Seasonal variation in the ultrasonic vocal activity of Humboldt's flying squirrel (<i>Glaucomys oregonensis</i>).

There were no statistically significant differences in call rates for arc chirps, tonal chirps, or upsweeps between seasons in Humboldt (Table 3 ); however, there tended to be a greater rate of trills in summer with a large effect size ( r = .52), although only marginally significant ( p = .051).

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