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This study characterizes the occurrence and acoustic behavior of beaked whales in the Foz do Amazonas Basin using combined visual and passive acoustic monitoring along the Brazilian Equatorial Margin. Audio files were analyzed to identify clicks with frequency-modulated pulses, a diagnostic characteristic of beaked whales. The PAMpal package in R was used to calculate acoustic parameters, including peak frequency, 3- and 10-dB bandwidths, and inter-pulse intervals. Three sightings, eight acoustic detections, and one combined visual-acoustic detection were recorded. Based on diagnostic features, sighting D01 likely corresponds to Mesoplodon europaeus, D05 may represent Mesoplodon, and D06 could belong to either Ziphius or Mesoplodon. Unsupervised clustering based on peak frequency and inter-pulse intervals revealed three distinct acoustic clusters, suggesting that at least three different beaked whale species were detected. Further acoustic classification studies are needed to determine the specific species associated with each cluster. These findings contribute to a broader understanding of the distribution and acoustic ecology of deep-diving beaked whales in the Foz do Amazonas Basin, a region where information on marine megafauna remains scarce.<\/jats:p>","DOI":"10.1121\/10.0038973","type":"journal-article","created":{"date-parts":[[2025,9,9]],"date-time":"2025-09-09T14:46:01Z","timestamp":1757429161000},"page":"1879-1891","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Finding beaked whales in the Foz do Amazonas basin: Visual and acoustic records of a deep diving cetacean"],"prefix":"10.1121","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0517-3264","authenticated-orcid":false,"given":"Raphael Barbosa","family":"Machado","sequence":"first","affiliation":[{"name":"Instituto Aqualie 1 , Juiz de Fora, MG 36036-330,","place":["Brazil"]},{"name":"Laborat\u00f3rio de Ecologia Comportamental e Bioac\u00fastica, Instituto 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