A yukkuri whose full adult size is significantly smaller than the norm. Common types include:
- House-yu: A cockroach-like pest that infests human residences, popularized by Kiriraitaa.
- Mini-yu (a.k.a. Bean-yu): Once a generic term for any type of miniature yukkuri (pest or pet), now sometimes used for those that are NOT House-yus, especially those that are bred and marketed as pets.
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