Lyril wrote:I'm in south-eastern Australia. Monarchs (we call them Wanderers) have been in this country since the 1820s and have spread wherever Asclepias sp. grows, as in other countries. But little is known about where they over-winter, or their migrations, if indeed they do.
In the temperate zone latitudes of Australia (roughly higher than 32 degrees S) and elsewhere around the world most monarchs enter reproductive diapause in late summer or early fall (March & April in Australia) and migrate to overwintering sites.
In Australia, because there are so many eucalyptus trees and only dozens to hundreds of monarchs in any given area instead of thousands, it can be hard to locate the overwintering sites, but they are there and quite widely scattered. Some are in the Adelaide area, for example, and on Flinders Island inbetween Australia and Tasmania. And lots of cluster sites can be found in the hilly pasture country slightly west and southwest of Sydney. I don't know of anyone who has looked for sites in Victoria, Australia.