Extended Data Fig. 2 | Examples of canary song phrase sequences, rare
inter-phrase gaps, and aberrant syllables. a, Additional spectrograms of
phrase sequences (colours above the spectrograms indicate phrase identity)
that lead to a repeating pair of phrases (pink and yellow). b, Examples of f lexible
phrase sequencing comprising pitch changes (from bird 3). c, Examples of
phrase transitions with a pitch change from bird 2. dāf, Phrase sequences
showing changes in spectral and temporal parameters. d, Bird 1 changes from
up sweep (purple) to down sweep (dark red) through intermediate phrases of
intermediate acoustic structure. e, Bird 1 shows a change in inter-syllable gaps.
f, Bird 2 shows changes in pitch sweep rate. g, Top and bottom sonograms
compare the same phrase transitions where the inter-phrase gap varies.
h, i, The top sonogram includes a rare vocalization at the beginning of the
second phrase (highlighted) that, in i, resembles the onset of an orange phrase
type.