It is quite easy to differentiate male and female birds because, across most species, the male is a different color to the female.<br /><br />However, blue jays are the same, making it difficult to identify whether they are male or female.<br />This is known as sexual monomorphism.<br /><br />For blue jays, the easiest way to tell them apart is that males are usually larger than females.<br /><br />The other way is through courtship. Usually, there will be one female surrounded by males who will follow and mimic her moves.
