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Breeding under snow cover in Norway rats (Rattus norvegicus) on uninhabited islands in Hokkaido, Japan
Yabe T., Minato R., Hashimoto T.
P. 43-46
We analyzed age distribution of Norway rats (Rattus norvegicus) on uninhabited islands, Yururi (168 ha) and Moyururi (31 ha) in the subarctic climate zone in Hokkaido, Japan. Age was estimated from eye lens weight. From the age distribution of 73 rats caught in July–August 2013, we found that 10 rats of them were born under the snow cover from December to March.

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