The Puku is a medium-sized marshland antelope. When scared, puku repeat a shrill whistle sound. Females gather in herds of up to 20 individuals. During the rainy season, many herds will come together for added safety, typically reaching around 50 females. Males hold territories and attempt to persuade herds of females to stay within their territories for as long as possible. In the wet season, due to large floods in their habitat they migrate to a high elevation and in dry seasons remain near water.