Mate Recognition and Expression of Affective State in Croop Calls of Northern Bald Ibis (Geronticus eremita)


Northern Bald Ibis are socially monogamous and year-round colonial birds with a moderate repertoire of calls. Their 'croop', for example, is used during greeting of mates, but also during agonistic encounters, and provides an ideal case to study whether calls are revealing with respect to motivational states. We recorded croop calls in a semi-tame and free… (More)
DOI: 10.1371/journal.pone.0088265

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