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Sample size of high-quality recordings of individually identified Kaua‘i ‘amakihi, ‘anianiau, and ‘akeke‘e during each time period.

Representative ‘akeke‘e song spectrogram displaying the 11 measured acoustic variables : 1) song length (seconds), 2) total number of syllables (n=11), 3) number of unique syllable types (n=2), 4) trill rate (total syllables/song length), 5) average number of notes per syllable (n=1.5), 6) average number of frequency changes within a syllable (n=1.6), 7) number of frequency changes between syllables within the song (n=2), 8) peak frequency (kHz), 9) low (kHz) and 10) high (kHz) frequencies at which the amplitude exceeded -24dB relative to the peak, and 11)frequency bandwidth (kHz).

Detailed information about each Kaua‘i ‘amakihi, ‘anianiau, and ‘akeke‘e recording including: unique identifier, date, location, and recordist, and type of recording equipment used to record each vocalization (recorder, microphone, and accessories). The unique identifier (Record ID) is the catalogue number given to each recording archived at The Macaulay Library at the Cornell Lab of Ornithology.

Detailed information about each Kaua‘i ‘amakihi, ‘anianiau, and ‘akeke‘e recording including: unique identifier, date, location, and recordist, and type of recording equipment used to record each vocalization (recorder, microphone, and accessories). The unique identifier (Record ID) is the catalogue number given to each recording archived at The Macaulay Library at the Cornell Lab of Ornithology.