Dear MARMAM and ECS Talk subscribers, Happy July! Apologies to those of you who will receive duplicate emails due to cross-posting. The titles listed below represent the contents of the most recent issue (Volume 47, issue 4, 2021) of Aquatic Mammals that is published online. Aquatic Mammals is the longest running peer-reviewed journal dedicated to research on aquatic mammals and is published quarterly with manuscripts available as published PDFs in real time. Further information about the journal can be found at: http://www.aquaticmammalsjournal.org/ <http://www.aquaticmammalsjournal.org/> To submit a manuscript for publication consideration, please visit: http://am.expressacademic.org/actions/author.php <http://am.expressacademic.org/actions/author.php> Thank you for your continued interest in the journal and abstract postings. With regards, Kathleen M. Dudzinski, Ph.D. Editor, Aquatic Mammals Journal business@aquaticmammalsjournal.org <mailto:business@aquaticmammalsjournal.org> Volume 47, Issue 4 (Items preceded by an ** are open access) Victoria Sorriba, Lia Lujan, Viviana De los Santos, Adam W. Stern, Federico R. Vilaplana Grosso, and Juan Pablo Damián. (2021). Comparison Between Digital Radiography and Computed Tomography for the Detection of Metal Fragments in Postmortem Examined Pinniped Skulls. Aquatic Mammals, 47(4), 321-329. https://doi.org/10.1578/AM.47.4.2021.321 <https://doi.org/10.1578/AM.47.4.2021.321> Nicoli Eiras, Samira Costa-Silva, Thais H. M. Melo, Luciana Veríssimo, and Milton C. C. Marcondes. (2021). Unusual Behaviour of Humpback Whale (Megaptera novaeangliae) Mothers and Calves. Aquatic Mammals, 47(4), 330-336. https://doi.org/10.1578/AM.47.4.2021.330 <https://doi.org/10.1578/AM.47.4.2021.330> Holli C. Eskelinen and Brittany L. Jones. (2021). Acoustic Characteristics of Bubblestream-Associated Whistles Produced by Atlantic Bottlenose Dolphins (Tursiops truncatus) During the First Thirty Days of Life. Aquatic Mammals, 47(4), 337-348. https://doi.org/10.1578/AM.47.4.2021.337 <https://doi.org/10.1578/AM.47.4.2021.337> **Douglas J. Krause and Jefferson T. Hinke. (2021). Finally Within Reach: A Drone Census of an Important, But Practically Inaccessible, Antarctic Fur Seal Colony. Aquatic Mammals, 47(4), 349-354. https://doi.org/10.1578/AM.47.4.2021.349 <https://doi.org/10.1578/AM.47.4.2021.349> Brian C. Balmer, Stephen D. McCulloch, Todd R. Speakman, Jeffrey Foster, Larry J. Hansen, Wayne E. McFee, and Gregory D. Bossart. (2021). Comparison of Short-Term Satellite Telemetry and Long-Term Photographic-Identification for Assessing Ranging Patterns of Individual Common Bottlenose Dolphins (Tursiops truncatus) in the Waters Around Charleston, South Carolina, USA . Aquatic Mammals, 47(4), 355-361. https://doi.org/10.1578/AM.47.4.2021.355 <https://doi.org/10.1578/AM.47.4.2021.355> Guillermo J. Sánchez Contreras, Barbara Biancani, Nicola Pussini, Claudia Gili, Livio Galosi, and Giacomo Rossi. (2021). Multimetastatic Hepatocellular Carcinoma in a South American Sea Lion (Otaria flavescens; Shaw, 1800). Aquatic Mammals, 47(4), 362-370. https://doi.org/10.1578/AM.47.4.2021.362 <https://doi.org/10.1578/AM.47.4.2021.362> Jessica Post, Mystera M. Samuelson, Debra P. Moore, and Moby Solangi. (2021). Brachygnathia Superior Observed in a Juvenile Common Bottlenose Dolphin (Tursiops truncatus). Aquatic Mammals, 47(4), 371-375. https://doi.org/10.1578/AM.47.4.2021.371 <https://doi.org/10.1578/AM.47.4.2021.371> **Miriam Marmontel, Danielle dos Santos Lima, Claudia Funi, Valdenira Ferreira dos Santos, and Marcelo Oliveira-da-Costa. (2021). Unveiling the Conservation Status of Inia and Sotalia in the Brazilian Northeastern Amazon. Aquatic Mammals, 47(4), 376-393. https://doi.org/10.1578/AM.47.4.2021.376 <https://doi.org/10.1578/AM.47.4.2021.376> **Ronald A. Kastelein, Lean Helder-Hoek, Linde N. Defillet, Léonie A. E. Huijser, John M. Terhune, and Robin Gransier. (2021). Temporary Hearing Threshold Shift in California Sea Lions (Zalophus californianus) Due to One-Sixth-Octave Noise Bands Centered at 2 and 4 kHz: Effect of Duty Cycle and Testing the Equal-Energy Hypothesis. Aquatic Mammals, 47(4), 394-418. https://doi.org/10.1578/AM.47.4.2021.394 <https://doi.org/10.1578/AM.47.4.2021.394>