How do the descendants of monarch butterfly all over Canada and the US eventually, after migrating for several generations, manage to return to a few relatively small overwintering spots?

How do the descendants of monarch butterfly all over Canada and the US eventually, after migrating for several generations, manage to return to a few relatively small overwintering spots?

Wikipedia - List of unsolved problems in biology

Curiosity and research will solve these problems.

America's god-soaked science deniers would rather give up and say the Magic Man did it.

Male

Female