In the spring, surviving monarchs fly north, stopping at fields of milkweed to lay eggs. Succeeding generationscontinue the northward migration until the cycle starts over in the fall.

• 春天,度过了寒冷冬天存活下来的帝王蝶飞回北方停在生长牛奶草的田野里产卵。成功繁殖以后秋天又开始迁徙,如此循环。