Do the Eastern and Western Monarchs ever enter each others territories throughout their entire life cycle?
Yes, there have been several recent reports that suggest that some monarchs from the west overwinter in Mexico, and there also is some evidence that some of the monarchs from the over wintering sites in Mexico fly northwest to become a part of the western population. There is a great deal that we don’t know about the degree to which these two populations mix. Q: Our class agrees that Monarchs are beautiful, and fill and an important niche in ecosystems through pollination, etc. When a serious decline happens in Monarch populations, due to a natural disaster, what can we do to help protect the survivors once they arrive in our areas and face more dangers like tachinid flies? A: The most important thing that all of us can do for monarchs is to preserve their habitats: during the breeding, migrating and overwintering parts of their life cycles. We can also make sure that they are not exposed to pesticides, and that their host plant, milkweed, is not eliminated due to herbicide use. From: