The Effects of Social Experience and Gonadal Hormones on Retrieving Behavior of Mice and their Responses to Pup Ultrasonic Vocalizations Okabe, Shota and Nagasawa, Miho and Kihara, Takashi and Kato, Masahiro and Harada, Toshihiro and Koshida, Nobuyoshi and Mogi, Kazutaka and Kikusui, Takefumi, Zoological Science, 27, 790-795 (2010), DOI:http://dx.doi.org/10.2108/zsj.27.790