Dear MARMAM community, My colleagues and I are pleased to share our new publication, "Specimens of opportunity provide vital information for research and conservation regarding elusive whale species." *Summary*: Elusive species are challenging to study and conserve because basic elements of their biology may be unknown. Specimens of opportunity provide a means of collecting information on these species and may be critical for elusive species’ conservation. We used snowball sampling to identify Sowerby’s beaked whale (Mesoplodon bidens) specimens in museums and research institutions. Snowball sampling proved highly effective: we located 180 specimens from 24 institutions in North America and Europe, 62 of which were not listed in online collections databases, resulting in the largest collated dataset for this species. Analysis of these data resulted in several new findings for this species, including significant morphological variation between specimens from different collection regions, suggesting the presence of previously unidentified population structuring in this species. These data provide critical information regarding this species and demonstrate the effectiveness of specimens of opportunity for elusive species research and conservation. We recommend other researchers consider snowball sampling when designing research projects utilizing specimens of opportunity. Our results demonstrate the usefulness of snowball sampling and specimens of opportunity to elusive species research and conservation, and the methods of our study can be readily adapted for other species. https://doi.org/10.1017/S0376892920000521 Please do not hesitate to contact us with any questions! Cheers, Kerri *--Kerri J. Smith, Ph.D.* Postdoctoral Researcher, Biology and Environmental Science, Baylor University Research Fellow - Smithsonian Institution Website <https://kerrijsmith.wordpress.com/>