The bison rut has begun! 🦬 From late July through August, male bison (bulls) compete for the chance to mate. You’ll hear deep bellows echoing across the prairie—these vocalizations are a way for bulls to show off their strength and ward off rivals. Sound on to experience this powerful natural behavior! Video: Bull bison standing in a bison wallow grunting. Credit: Nancy Corona/USFWS | Neal Smith National Wildlife Refuge