KAUKAUNA — The annual migration of monarch butterflies from North America to Mexico is under way, and the Fox River is among the major routes.
Naturalist Rob Zimmer also includes the Green Bay Botanical Garden, High Cliff State Park in the prairies, Mosquito Hill Nature Center, and so many other places are good locations to watch.
The migration will peak in about two weeks. But there will be hundreds, if not thousands moving south this weekend, Zimmer says…