Applying durable markings on semi-aquatic animals is a problem in field research. Methods used for live-trapping, handling, and marking of animals strongly depend on the species considered and the circumstances at particular study sites. I provide a short overview on methods used for capturing and marking nutrias (Myocastor coypus). This review is supplemented by field experiences gathered while studying an urban population in Germany. Using a dip net, I captured animals and handled them without immobilizing agents. I used ear tags, radiocollars, and passive integrative transponders (PITs) for individual marking. Based on my review and experiences, PITs are effective for long-term individual marking; however, an acceptable method for visual long-term identification of single nutrias is needed.
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