The age of humans is increasingly an age of sameness. Across the planet, distinctive plants and animals are disappearing, replaced by species that are lucky enough to thrive alongside humans and travel with us easily. Some scientists have a word for this reshuffling of life: the Homogenocene. Evidence for it is found in the world’s museums. Storerooms are full of animals that no longer walk among us, pickled in spirit-filled jars: coiled snakes, bloated fish, frogs, birds.