Question: Can you explain me something about monarch butterflies emigration?

Ines Goncalves answered on 7 Mar 2017:

I confess I don’t know much about Monarch butterflies or any other butterflies in general but let’s see: Monarchs migrate up to 2500 miles up and down the US to escape the cold or return to their feeding grounds. In the Autumn, the move south and hibernate in eucalyptus trees around California/Mexico. Then in the Spring they migrate norther again to where trees and food are more plenty full. Now, the curious thing about Monarchs is that the butterflies that fly south are not the same ones that later fly north and it is not well understood how 2 generations later, so the next set of butterflies to fly south the following winter, know in which trees to hibernate, because apparently they always hibernate in the same trees. Here, I found this website that explains things much better than me and also has a lot more information: http://www.monarchwatch.org/tagmig/index.htm