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Fig. 2 | Frontiers in Zoology

Fig. 2

From: Raven food calls indicate sender’s age and sex

Fig. 2

Estimated means ± standard errors (SE) of the three PCs for different age-classes (a), and for male and female common ravens (b). PC1 summarizes acoustic properties related to the fundamental frequency of “haa” calls, PC2 includes call duration and source-related acoustic features, and PC3 amplitude-related measures

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Frontiers in Zoology

ISSN: 1742-9994