Zebra Swallowtail Butterfly Migration: This year sets records for the earliest migration and the fewest road closure days.
This year, the migration speed of the Danaus plexippus from the south to the north is earlier than usual, but the number is smaller. As of now, there are only 160,000, which is lower than the historical average of 220,000. In March, the advance team arrived early in Linnei Township, Yunlin County, setting a record for the earliest road closure in history, but there has not been a large-scale migration following that. Although there are still some Danaus plexippus departing from the butterfly valley in the south, the numbers are limited. Temperature changes may have affected their return north, and volunteers continue to monitor the situation.