| 摘要 |
In a front-opened box-shaped main casing, an underground passage forming member is provided which has a front-opened underground passage portion formed like a nest-hole. A transparent front panel is detachably attached to a front opening of the main casing so as to close the front opening thereof as well as the front-opened underground passage portion. As a result, a small pet animal, such as a hamster, can be observed while it maintains a more natural life style.
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