Ishizuka, Shintaro
Article History
Received: 10 February 2020
Accepted: 6 March 2020
First Online: 16 March 2020
Compliance with ethical standards
:
: The author declares no conflict of interest.
: This study was conformed to the Guidelines for Field Research established by the Ethics Committee of the Primate Research Institute, Kyoto University. The study was approved by Choshikei Monkey Park, and Takasakiyama National Zoo.