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- W2474655194 endingPage "1746" @default.
- W2474655194 startingPage "1734" @default.
- W2474655194 abstract "Most birds vocalize with an open beak, but vocalization with a closed beak into an inflating cavity occurs in territorial or courtship displays in disparate species throughout birds. Closed-mouth vocalizations generate resonance conditions that favor low-frequency sounds. By contrast, open-mouth vocalizations cover a wider frequency range. Here we describe closed-mouth vocalizations of birds from functional and morphological perspectives and assess the distribution of closed-mouth vocalizations in birds and related outgroups. Ancestral-state optimizations of body size and vocal behavior indicate that closed-mouth vocalizations are unlikely to be ancestral in birds and have evolved independently at least 16 times within Aves, predominantly in large-bodied lineages. Closed-mouth vocalizations are rare in the small-bodied passerines. In light of these results and body size trends in nonavian dinosaurs, we suggest that the capacity for closed-mouth vocalization was present in at least some extinct nonavian dinosaurs. As in birds, this behavior may have been limited to sexually selected vocal displays, and hence would have co-occurred with open-mouthed vocalizations." @default.
- W2474655194 created "2016-07-22" @default.
- W2474655194 creator A5003112410 @default.
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- W2474655194 creator A5040313272 @default.
- W2474655194 creator A5047662205 @default.
- W2474655194 creator A5049939308 @default.
- W2474655194 date "2016-07-12" @default.
- W2474655194 modified "2023-09-24" @default.
- W2474655194 title "Coos, booms, and hoots: The evolution of closed‐mouth vocal behavior in birds" @default.
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