What animals have a menstrual cycle?

Menstrual cycles are primarily observed in some primates, including humans, great apes, and certain species of monkeys. Other mammals, such as elephants and some bats, also experience menstrual-like cycles, but these are less common. In contrast, most mammals have an estrous cycle, which involves different reproductive behaviors and physiological changes. The menstrual cycle is characterized by the shedding of the uterine lining, a feature not present in estrous cycles.