Table 1 Variance component analysis results for principal components of ‘L’ phrases in Oriental tit responses to live snake and jay presentations. This table represents the results of Variance Component Analysis (conducted using the ‘VCA’ function in the R package ‘VCA’) for varimax-rotated principal components derived from 13 characteristics of ‘L’ phrases (PC1, PC2, PC3; see Supplementary Table S1). The analysis assesses the proportion of variance in each principal component explained by the predator type during live snake and jay presentation experiments, recorded with a Sennheiser me67 microphone (see Table 4 in Methods). The smaller proportion of total variance explained by the predator type (indicated in bold underlined font) indicates the larger degree of overlap in acoustic properties between calls given in response to the two different predators. The error can be interpreted as a within-trial variation of the principal component. This table also corresponds to Figs. 2A,B.

From: Unlearned adaptive responses to heterospecific referential alarm calls in two bird species from separate evolutionary lineages