The reproductive cycle of the female ferret, known The reproductive cycle of the female ferret, known as a jill, is a fascinating yet critical aspect of its biology that highlights the intricacies of animal behavior and reproductive health. When a female ferret enters heat, or estrus, she experiences a surge in estrogen levels that prepares her body for potential mating. This period can last for several weeks, during which the jill exhibits distinct behaviors, such as increased vocalizations and