As males reach the end of their journeys, they're actively searching females.

"Yellow thistles (as unsightly to some as they seem) are one of the most visited nectar plants by monarchs that I have seen over the years. They provide crucial nutrition and hydration that monarchs need on their journeys and during reproduction. Thankfully, this tattered male did not appear to be slowed down at all by his torn wings, but instead sped around quite handily as he seemed to search for females ~ in between sips of nectar of course."   — Kathy Metzger Montgomery, Texas

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