Half a century ago, the Kirtland’s warbler was on the brink of extinction. At its lowest, only 167 singing males remained in the wild.

Today, the small songbird’s recovery is cited as one of North America’s greatest conservation successes — proof that targeted intervention can pull a species back from the edge.

The turnaround came from decades of habitat management, monitoring and community involvement. Conservationists protected the young jack-pine forests the warblers need for nesting and controlled the brown-headed cowbird, a parasite that lays eggs in warbler nests.

The story is part of a wider week of conservation wins: scalloped hammerhead sharks gained stronger international protections after scientists mapped pregnant females’ migration routes between the Galápagos and Central American nurseries, and new marine reserves advanced global ocean protection targets.

At a time when biodiversity faces severe pressure, the warbler’s song carries a message: when science, communities and conservation groups work together, wildlife can recover and ecosystems can flourish.