gaúcha-de-cara-suja Muscisaxicola maclovianus

Small and rather distinctive terrestrial flycatcher, breeding in the southern Andes at high elevation and migrating north in winter where it can also be found in lowlands. Breeds in open rocky areas, sometimes down to level of open forest. Migrants often in flocks, sometimes a few hundred birds, as on playing fields and beaches. Upperparts relatively dark gray with blackish face mask, and an inconspicuous dark rusty nape patch. Resident Falkland population larger and plainer overall, likely a different species; found on moorland and beaches.