We are pleased to announce our new paper in Marine Mammal Science on blue whale reproductive competition and the use of D-Calls: *Visual and passive acoustic observations of blue whale trios from two distinct populations* Elena Schall, Lucia Di Iorio, Catherine Berchok, Diego Filún, Luis Bedriñana‐Romano, Susannah J. Buchan, Ilse Van Opzeeland, Richard Sears & Rodrigo Hucke‐Gaete This note is available as an early view version with open access under the following link: https://onlinelibrary.wiley.com/doi/10.1111/mms.12643 Best regards, Elena Schall -- Elena Schall PhD Student Ocean Acoustics Lab Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Klußmannstr. 3d 27570 Bremerhaven email: elena.schall@awi.de Phone: +49(471)4831-2157