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By adjusting direction, repetition rate, frequency content, and source level of their emissions, they actively control the information they obtain from returning echoes. We investigated how two trained bottlenose dolphins adjusted sound production as well as head, and body movements while approaching and discriminating between two spheres of different materials. We compared their performance with published data from harbor porpoises using the same paradigm. Harbor porpoise and bottlenose dolphin biosonar signals have different spectral and temporal properties that may affect their acoustic behavior and performance. If discrimination relies mainly on temporal cues, similar performance would be expected between the two species. If spectral cues dominate, porpoises should have an advantage. Both species exhibited comparable scanning behavior and a clear switch from longer inter-click intervals to short \u201cbuzz\u201d phases during target approach. The dolphins' discrimination performance was poorer than that of porpoises. Our findings indicate that porpoises possess more refined close-range discrimination abilities than previously assumed and highlight how species-specific signal design shapes information acquisition strategies in echolocating mammals.<\/jats:p>","DOI":"10.1121\/10.0044592","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T11:55:05Z","timestamp":1786362905000},"page":"1274-1287","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Target discrimination during active swimming in bottlenose dolphins (\n                    <i>Tursiops truncatus<\/i>\n                    )"],"prefix":"10.1121","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1065-9194","authenticated-orcid":false,"given":"Sara","family":"Torres Ortiz","sequence":"first","affiliation":[{"name":"Marine Biological Research Center, University of Southern Denmark 1 , Hindsholmvej 11, 5300 Kerteminde,","place":["Denmark"]},{"name":"Department of Biology, University of Southern Denmark 2 , Campusvej 55, 5230 Odense,","place":["Denmark"]},{"name":"Animal perception and cognition group 3 , calle Alemania 1, 38660 Adeje, Tenerife,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariana","family":"Hern\u00e1ndez S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Marine Biological Research Center, University of Southern Denmark 1 , Hindsholmvej 11, 5300 Kerteminde,","place":["Denmark"]},{"name":"Department of Biology, University of Southern Denmark 2 , Campusvej 55, 5230 Odense,","place":["Denmark"]},{"name":"Faculty of Science and Engineering, Link\u00f6ping University 4 , 581 83 Link\u00f6ping,","place":["Sweden"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Freja","family":"Jakobsen","sequence":"additional","affiliation":[{"name":"Marine Biological Research Center, University of Southern Denmark 1 , Hindsholmvej 11, 5300 Kerteminde,","place":["Denmark"]},{"name":"Department of Biology, University of Southern Denmark 2 , Campusvej 55, 5230 Odense,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Leyva Cortes","sequence":"additional","affiliation":[{"name":"Loro Parque Foundation, Avenida 5 de Loro Parque, sin n\u00famero, 38400 Puerto de la Cruz, Tenerife,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Almunia","sequence":"additional","affiliation":[{"name":"Loro Parque Foundation, Avenida 5 de Loro Parque, sin n\u00famero, 38400 Puerto de la Cruz, Tenerife,","place":["Spain"]},{"name":"Departamento de Biolog\u00eda Animal, Edafolog\u00eda y Geolog\u00eda, Avenida Astrof\u00edsico Francisco S\u00e1nchez, sin n\u00famero, Universidad de La Laguna 6 , 38200 La Laguna,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8239-5485","authenticated-orcid":false,"given":"Magnus","family":"Wahlberg","sequence":"additional","affiliation":[{"name":"Marine Biological Research Center, University of Southern Denmark 1 , Hindsholmvej 11, 5300 Kerteminde,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"key":"2026081007550417700_c1","volume-title":"Sensory Biology of Aquatic Animals","year":"2012"},{"key":"2026081007550417700_c2","first-page":"19","article-title":"Sensory systems and behavior","volume-title":"Behavioural Ecology\u2014An Evolutionary Approach","author":"Krebs","year":"1975","edition":"4"},{"key":"2026081007550417700_c3","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/978-3-662-22644-5","article-title":"Physical constraints in sensory ecology","volume-title":"Ecology of Sensing","author":"Barth","year":"2001"},{"key":"2026081007550417700_c4","volume-title":"Sensory Ecology, Behavior, and Evolution","year":"2013"},{"key":"2026081007550417700_c5","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/978-1-4614-9146-0_1","article-title":"Biosonar of bats and toothed whales: An overview","volume-title":"Biosonar","author":"Surlykke","year":"2014"},{"key":"2026081007550417700_c6","doi-asserted-by":"publisher","first-page":"276","DOI":"10.1152\/physiol.00008.2013","article-title":"Functional convergence in bat and toothed whale biosonars","volume":"28","year":"2013","journal-title":"Physiology"},{"key":"2026081007550417700_c7","doi-asserted-by":"publisher","first-page":"672","DOI":"10.1016\/S0003-3472(74)80015-1","article-title":"Sounds audible to migrating birds","volume":"22","year":"1974","journal-title":"An. 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