The number of Monarch Butterflies seem to be less this summer than last; it’s very sad. I’ve been taking portraits every time I see them dreading the year when we won’t see any at all.
Sometimes I get a zoomed picture and see the gender quite clearly. Males have a black spot on each hind wing.
The females don’t have the spots. The thickness of the veins on the wings are another indicator. The males have skinny veins and the females have thicker ones.