- 毛毛虫 máomaochóng caterpillarThe hairy larva of a butterfly or moth; also called [[毛虫|毛蟲|mao2 chong2]]
- 松毛虫 sōngmáochóng pine mothpine moth or pine caterpillar; a major forest pest whose larvae feed on the needles of pine and cypress trees
- 纤毛虫 xiānmáochóng ciliateA type of single-celled organism found in salt and fresh water that uses fine hairs for movement and feeding; includes organisms like the [[草履虫|草履蟲|cao3 lu:3 chong2]].
- 鞭毛虫 biānmáochóng flagellatea single-celled organism belonging to the group characterized by one or more whip-like appendages used for locomotion
- 旋毛虫病 xuánmáochóngbìng trichinosistrichinosis; trichiniasis
- 旋毛虫 xuánmáochóng trichinaA type of parasitic worm that lives in the small intestine and muscle tissue of humans and other mammals; humans are typically infected by eating undercooked meat.
- 小毛虫 xiǎomáochóng slugslug; a small shell-less gastropod mollusk