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Taiwan will cordon off part of a highway to create a safe passage for a huge seasonal migration of milkweed butterflies in the coming days, a highways official said Saturday. The butterflies -- indigenous to Taiwan -- migrate in late March from the south to the north, where they lay eggs. The young butterflies then fly south in November to a warm mountain valley near Kaohsiung to escape the winter cold. To protect the migrating butterflies, a 600-yard stretch of highway in Yunlin County in southern Taiwan will be sealed off as the migration peaks; nets will be set up to make the butterflies fly higher and avoid passing cars, and ultraviolet lights will be installed to guide the butterflies across a highway overpass.