Studies of bird vocalizations are numerous and focus on various topics, including the characterization of spectro-temporal and structural parameters and seasonal differences throughout the year. Recordings from sound collections are a useful tool for characterizing vocalizations and their variation. In this study we aimed to (1) characterize the types of vocalization of Streak-backed Orioles from the state of Morelos based on spectral, temporal, and structural parameters; (2) compare vocalizations from the breeding and nonbreeding seasons in terms of vocal richness, vocal diversity, and chatter rate; and (3) compare our results with those obtained in a previous study of a single location within the study area. To achieve these objectives, we measured acoustic attributes from files from 3 sound collections. We measured the frequency at 5% and 95%, frequency range, peak frequency, duration of vocalizations, chatter rate, and vocal richness and diversity using 40 recordings. We used descriptive statistics to characterize the vocalizations and nonparametric tests to compare vocal richness and chatter rate between seasons. We identified 6 song variants, all of which were emitted at frequencies between 2.63 and 4.24 kHz. We also identified 3 types of calls (chits, chatters, and whines), whose frequencies reached <1 and >8 kHz. Vocal richness and diversity were significantly higher during the breeding season. Chatters were common in both seasons and associated with territorial defense. Our study shows the importance of sound collections to generate knowledge about vocal characteristics in birds. Received 24 October 2022. Accepted 1 January 2024.

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