BACKYARD SECRET: WHAT DO ADULT MAYFLIES DINE ON? backyardwildlifeconnection by Terry W.Johnson 9 years ago This is a trick question. Adult mayflies do not feed at all. Even if a mayfly was hungry, it could not eat. The reason for this is they do not have functional mouthparts. In addition, their digestive system contains only air. Share this: Email a link to a friend (Opens in new window) Email Share on Facebook (Opens in new window) Facebook More Share on X (Opens in new window) X
