Thursday, August 23, 2018

Monarch Butterflies

Yesterday, 22 August 2018, Erika and I discovered thousands of Monarch Butterflies in the Carleton College arboretum in Dakota County, Minnesota. Although it was almost noon, the butterflies appeared to be roosting at the edge of an oak forest on the west edge of the prairie. Some of them were mating. As we walked down the path, hundreds flushed in front of us. We have never seen such a concentration of butterflies. The scene reminded us of photos of monarchs wintering in Mexico. Getting a photo of the swarm proved impossible, and I never thought of trying to take a video. This concentration of butterflies does not appear to be a local aggregation, since K. C. Jensen recently reported large numbers of Monarchs in Brookings, South Dakota.

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