Hundreds of monarch butterflies resting on a pine tree in Angangueo, Mexico, last Saturday, as thousands of the striking orange-and-black insects began arriving at their winter home in their annual migration. The 4,800km mass migration of monarch butterflies in North America is one of the insect world's fantastic feats, with millions embarking on the arduous journey from as far north as Canada down into Mexico and the California coast each autumn.
Long trip home




