Mayflies are unique in that they moult one more time after getting functional wings (this is known as the "alate" stage). This second-to-last winged stage is usually very short, lasting from 30 minutes to one day, depending on the species. The function of the adult imago is reproduction and dispersal; they do not eat. The stage is a favorite food of many fish, and many 'fishing flies' are modeled on them.