オオイワタイランチョウ Muscisaxicola albifrons

Largest ground-tyrant, usually identified readily by (relatively) big size and high Andean range. Usually seen as singles or pairs foraging on bogs, but also ranges into adjacent rocky puna habitats. Plumage rather plain overall with contrasting dirty whitish forehead patch; pale wing edgings create distinctive “frosty-winged” appearance in flight. Confusion only likely with smaller Ochre-naped Ground-Tyrant, on which ochre nape can be hard to see.