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Water droplets condensed on the monarch's wings.
This monarch failed to fly back into the clusters before nightfall. Water droplets condensed on its wings. This is a very precarious situation. The dew can freeze when the overnight temperature drop below freezing. This often happens in open areas that are exposed to the cold, clear sky.

Water droplets condensed on the monarch butterfly's wings.

Photo ©Lincoln Brower, Sweet Briar College