***apologies for cross-postings*** The *Discovery of Sound in the Sea (DOSITS)* <http://www.dosits.org> Team is pleased to announce the second set of underwater acoustics webinars as part of its 2021 Underwater Acoustics Webinar Series. On Tuesday, *October 5, 2021*, Dr. Darlene Ketten will provide an overview of *marine mammal hearing and causes of hearing loss*; on Thursday, *November 4, 2021*, Dr. Michael Bellman will provide an overview of *underwater sound mitigation and abatement*. Both webinars will begin at *12pm ET*. These *free* webinars will be *hosted virtually* via Zoom (with an associated, live YouTube stream), last approximately 60 minutes, and will consist of a presentation followed by a period of facilitated question and answer. *The webinars will be recorded and archived on the 2021 DOSITS Webinar Series page <https://dosits.org/decision-makers/webinar-series/2021-webinar-series/>, on the DOSITS website. * The 2021 DOSITS webinar series is open to all interested individuals, however, *registration is required for each webinar event*. Please visit the 2021 DOSITS Webinar Series page ( https://dosits.org/decision-makers/webinar-series/2021-webinar-series/) for a registration link and additional webinar series details. *Zoom and YouTube links will only be shared with registered participants*. A webinar outline, with links to relevant background content on DOSITS, will be made available in advance of each webinar. All registered participants are encouraged to preview this outline prior to each webinar event. The DOSITS Project continues to offer a *Certificate of Professional Development* for interested individuals that participate in all four of the webinars in the 2021 Underwater Acoustics Webinar Series. *There are no fees associated with this certificate, however, in addition to webinar participation, after each webinar, interested individuals must complete a brief survey*. In order to receive a certificate, eligible individuals must either participate in the live webinar events during the 2021 series, and/or watch the 2021 webinar videos, *and* complete the four, individual webinar reflection surveys. If you have any questions, please contact Holly Morin (holly_morin@uri.edu).