Dear Colleagues, We are very pleased to inform you about the Cetacean Population Studies (CPOPS) Vol. 2 <https://cpops.jp/archive/index.html> publishing online. CPOPS is a peer reviewed online journal focusing on cetacean and other marine mammal studies. For detailed information about CPOPS please see here <https://cpops.jp/published_prospectus/index.html>. The next volume, CPOPS Vol. 3, will be designated as* “Memorial Volume for Dr. Seiji Ohsumi”* which passed away in November last year. We would greatly appreciate if you could peruse this information and consider contributing in the near future through submitting papers <https://cpops.jp/paper_submission/index.html> for CPOPS Vol. 3 and also introduce our new journal to your colleagues who may have an interest in cetacean and other marine mammal studies. Best regards, Hidehiro Kato, Ph. D. Chairman, Publication committee for the CPOPS https://cpops.jp