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Figure S1. The molecular phylogeny of the 20 New Zealand species used in the comparative analysis of begging calls.

Figure S2. Example spectrograms of the begging calls of (A) shining cuckoo and three New Zealand passerine species: grey warbler (B), bellbird (C), and whitehead (D).

Table S1. Locations and samples sizes for the begging call recordings made for each species.

Table S2. Definitions of the sound measurements used in the analysis of begging calls.

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