The Japanese otter has been protected by game law since 1928, but now it is on the brink of extinction from Japan. In the previous five years from 1923 to 1927, 325 individuals were lawfully captured as shown in Table 1.
In this paper, unknown and additional records of the Japanese otter are given from Fukushima, Ibaragi, Saitama, Tochigi, Gunma (Figs. 1-3) and Wakayama (Fig. 4) with a few suggestive informations of survival in Honshu. On the basis of the literature hitherto known and a new additional example from Gunma, the author think that the litter-size of the Japanese otter in a wild state is usually 2.
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