Sixteen Myocastor coypus (Nutria) were implanted with radiotransmitters and monitored on a freshwater floating marsh. Mortality and/or transmitter failure was high, with 5 transmitters failing or being destroyed through predation within 3 days of release. Predation mortality was common, with an additional 5 transmitters recovered from carcasses within 35 days of implantation. The remaining 6 animals survived for a mean of 182 days. After removing first movement distances from the analyses, the mean distance traveled between locations for surviving animals was 77.4 m. Distances varied significantly between seasons, but not between the sexes. The average minimum convex polygon (MCP) for individuals with sufficient data was 28.8 ha and the 95% fixed kernel (FK) estimates averaged 32.7 ha. There was no significant difference between home-range estimates overall or between the sexes.