Received: 26 October 2020
Accepted: 12 January 2021
First Online: 28 January 2021
Ethics approval and consent to participate
: This study was part of the routine work of the Okinawa Churashima Research Center, Okinawa Churashima Foundation, Okinawa, Japan. For the stranded animal management, relevant approval were issued to Okinawa Churashima Research Center by the Okinawa Prefectural Government.
: Not applicable.
: The authors declare that they have no competing interests.