Are the mammary papillae found on both sexes of pigs?

Yes, mammary papillae, commonly known as nipples, are found on both male and female pigs. While only female pigs (sows) develop fully functional mammary glands for nursing, males (boars) possess mammary papillae as well, although they do not serve a reproductive function. The presence of mammary papillae in both sexes is a common characteristic among mammals.