Seven Biomes: A Walk Through the Living World

Grassland: open plains that shape and are shaped by their grazers, from the African elephant's keystone browsing to the American bison's recovering herds and the honey bee's pollination work among the wildflowers.

Desert: where the saguaro cactus runs photosynthesis backwards from most plants, opening its pores only at night to save water none of its neighbors can spare.

Marine: the blue whale, the largest animal that has ever lived, and the vaquita, among the smallest and most endangered, share an ocean that also holds the Great Barrier Reef's coral-algae symbiosis and its own quiet erosion, one grazing parrotfish bite at a time.

Temperate forest: the giant sequoia, the most massive living tree on Earth, stands beside the giant panda's narrow bamboo range and the monarch butterfly's multi-generational migratory arc.

Boreal forest: the cold northern range of the gray wolf, whose presence or absence reshapes an entire forest's browsing pressure and, through it, its rivers.

Tundra: the emperor penguin's Antarctic breeding march and the Arctic tern's pole-to-pole migration, the two longest and hardest journeys in this atlas, meeting at opposite ends of the Earth.

Tropical rainforest: the Amazon's own flying rivers feed the water cycle that sustains it, home ground for the mountain gorilla and the Sumatran tiger, two of this wave's starkest conservation stories.