Will Knowlton:
Rufous-collared Sparrow, Machu Picchu, Peru
Will Knowlton:
Golden-billed Saltator, Machu Picchu, Peru
Will Knowlton:
Golden-billed Saltator, Machu Picchu, Peru
Will Knowlton:
Black-throated Flowerpiercer, Lake Titicaca, Peru
Will Knowlton:
Black Siskin, Lake Titicaca, Peru
Will Knowlton:
Mourning Sierra-Finch, Lake Titicaca, Peru
Will Knowlton:
Green-and-white Hummingbird, Aguas Calientes, Peru
Will Knowlton:
Silvery Tanager, Aguas Calientes, Peru
Will Knowlton:
Torrent Tyrannulet, Aguas Calientes, Peru