As you know, questions about Monarch butterflies are always welcome here. My first question comes from none other than my dear sweet mom. She writes: "How can you tell males from females in Monarch butterflies?"
That's a good question. It's really quite simple. Male Monarchs have two black dots on their lower two wings. (see photos below.) Females do not have these dots. The dots are in fact scent glands which releases a pheromone that attracts the females to them for the purpose of mating.