Cyclones and the subsequent flooding they cause can have devastating impacts on wildlife. However, the way in which different species are affected can vary depending on a range of factors, including their body size. Here, we use data collected in the aftermath of Cyclone Idai, which made landfall in Mozambique in March 2019, to investigate how body size influenced the survival of mammals in the affected area. Our results suggest that larger-bodied mammals were more likely to survive the cyclone and subsequent flooding compared to smaller-bodied species. While this pattern is consistent with predictions from previous studies, our findings provide important insights into the specific impacts of extreme weather events on mammal communities in the region and can help inform future conservation efforts.