The monarchs that winter on trees in Mexico have already traveled long distances from the East Coast, and particularly the Midwest. Scientists now know that the fir trees store solar heat in their trunks, which helps warm the butterflies.
These are in the butterfly garden at our new house in July.
It's March. Butterflies in Mexico are instinctively becoming active now. Mating will begin and males die off. By the end of the month the females will start to fly north into Texas where they will lay their eggs. After laying eggs, the females die.