A butterfly that went extinct decades ago after the destruction of its Bay Area habitat is now the driving force behind its ...

With a wingspan of only 0.5 to 0.75 inches, the Western pygmy blue butterfly (Brephidium exilis) is the smallest butterfly found in North America and one of the smallest in the world.

The blue morpho is the largest butterfly at 6 to 8 inches. They are hard to miss. “They have a much larger wingspan, and their wings are not clear,” Dunham said. “They’re two different colors.