Arts

The Forest of the Monarchs – grand prize winner
What looks like sunlit foliage on trees are actually millions of monarch butterflies. The only species that migrates to avoid North America’s winter, they fly up to 3,000 miles south to Mexico’s warm and humid Sierra Madre mountains. The butterflies cluster on oyamel fir trees, cozying up to generate warmth and conserve energy as temperatures dip.
Photograph: Jaime Rojo/BigPicture: Natural World Photography Competition/California Academy of Sciences