It can take 5 life cycles for monarch butterflies to migrate back to the U.S., then the next year, later generations migrate back to the same spot in Mexico, but those butterflies have never been there. The great mystery for me is how they know where to go.
It can take 5 life cycles for monarch butterflies to migrate back to the U.S., then the next year, later generations migrate back to the same spot in Mexico, but those butterflies have never been there. The great mystery for me is how they know where to go.