Understanding the function of bird calls requires reports of call use in the wild with appropriate notes on context of use and call structure. This information is particularly limited for Neotropical birds. Here, I report 2 encounters with 1 female Great Curassow (Crax rubra) in the context of nest defense where 2 types of alarm calls were vocalized: barks and snarls. For both of them, I expand on their acoustic description using spectrographic analyses. Additionally, I provide evidence for the different levels of agitation associated with each call. Finally, I compare my observations with 3 available reports on alarm call use in the species and suggest potential functions to be tested in the future.

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