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Fig. 4. Allometric plot of chemoreceptor spike frequency adaptation vs
body mass (Table 1). The heavy
black regression line was calculated without phylogenetic correction (dotted
line indicates 95% confidence interval); the heavy gray regression line was
calculated with phylogenetic correction (see text). Regression parameters are
summarized in Table 3. Values
shown are all from this study: lovebird, quail, pigeon, Pekin duck and goose
(see text). Silhouettes identify specific data points and are not scaled to
actual bird size.