Abstract
The spectral analysis of electromyograms from evening grosbeaks, Hesperiphona vespertina, and common grackles, Quiscalus quiscula, revealed a statistically significant higher upper cut-off frequency during shivering in the former species. There was also a statistically significant decrease in the upper cut-off frequency with lowering of temperature in the evening grosbeak, but not in the grackle. The frequency of occurrence of various amplitudes during shivering followed the normal distribution closely in both species. The presence of frequencies in the range from 6 to 600 c.p.s. necessitates the use of wideband instrumentation for fidelity in measuring species differences.
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