Across the grasslands of Wyoming, the prairie dog lives in bustling underground towns, popping up to survey its domain and calling out in a complex language of chirps and barks. Long dismissed by many as a pest, this small rodent is in fact a keystone of the entire prairie ecosystem.

The prairie dog's importance far exceeds its size. Its burrows aerate the soil and provide shelter for other animals, from burrowing owls to snakes, and its grazing shapes the vegetation of the plains. Above all, it is a crucial food source, feeding predators including hawks, eagles, badgers, coyotes, and the highly endangered black-footed ferret, which depends on prairie dogs almost entirely.

That last connection makes the prairie dog a linchpin of conservation. The black-footed ferret, one of North America's rarest mammals, cannot survive without healthy prairie dog colonies, so protecting the rodent is essential to saving the ferret and the broader community of grassland life it supports.

Yet prairie dogs remain controversial. Ranchers often view them as competitors for forage and hazards to livestock, and the animals have been poisoned and shot across much of their range, shrinking their numbers dramatically. The debate over their fate is really a debate over the prairie itself, and whether a maligned little rodent will be recognized as the foundation of grassland life that it truly is.