This tiny, delicate butterfly is in the same family as the white cabbage butterflies that are pests in the garden but these butterflies are not usually pests. Their wingspan is only 2–3.2 cm (0.7 to 1.2 in)! For comparison, the monarch butterfly has a wingspan of 7 to 10 cm (3 to 4 in)! You might think that the dainty sulphur is the smallest butterfly in North America but this distinction goes to the Western pygmy blue butterfly that can have a wingspan of only 1.2 cm (0.5 in)!