Which continents enjoy this magnificent butterfly?
Answer: All continents except Antarctica.
How can we understand their ability to colonize and breed in so many diverse places?
Answer: They enjoy many, many different hosting plants.
Where do they winter-over in the Northeastern U.S.? In tree hollows? Under the forest leaf covered floor? Under rocks and fallen timber?
Answer: They don’t winter-over in the Northeastern U.S..
Why don’t they winter-over from Georgia to Maine?
Answer: They cannot tolerate freezing temperatures.
So where do Vanessa cardui found in New Hampshire, Pennsylvania, Virginia and North Carolina originate from?
Answer: The Mexican Plateau!
OK. Then which U.S. airlines bring them up from there?
Answer: None. They fly up from south of the border (Mexican) on their own gossamer wings.
When can we hope to see them in Pittsburgh in 2013?
Answer: Late April to May. Another joy of springtime.