| Up again to a cold puna crossed by another frozen river and dotted with many llamas. |
| He published seminal papers on the ecology of the puna avifauna and on the breeding biology of several of its endemic species. |
| We also saw guanacos, vicuñas, wild donkeys, nesting Andean Tagua coots, Pato puna ducks with vivid blue bills, and a dozen other bird species, but very little human traffic. |
| On the high, cold plains, known in the Andes as puna, there are only two seasons: summer every day and winter every night. |
| These valles, quebradas and puna are the three inhabited zones of the Andes. |
| On reaching the puna, our party had made their day's journey, and would have halted. |
