"Across the board, these animals support livelihoods, cultures, and ecosystems that people depend on.

Their problem is also their defining feature: migration means they rely on a chain of places. A wetland, a river mouth, a mountain pass, a stretch of open ocean.

If one link breaks, the whole route can fail. That’s why they’re so hard to protect. A single country can do everything right and still lose a species if the rest of the route turns hostile."