Learn how to differentiate males from females
Males have two lower black dots (these are odor glands)
Females have thicker wing veins
They migrate in an annual pilgrimage of 2,500 miles approx. using an internal compass. This compass uses the location of the sun in the sky and the time of the day. It takes 4 or 5 generations to make it to Canada. Their life span is 2 to 6 weeks.