| He published seminal papers on the ecology of the puna avifauna and on the breeding biology of several of its endemic species. |
| Up again to a cold puna crossed by another frozen river and dotted with many llamas. |
| 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. |
| By the end of our third day, Yábar's sharp eye and experience had turned up an impressive list of species, including local marvels like the Andean duck, the puna tapaculo, the shining sunbeam and the versicolored barbet. |
| There must be something worth looking at in this huge expanse of dry puna that stretched away from us to some distant humps. |
| On the high, cold plains, known in the Andes as puna, there are only two seasons: summer every day and winter every night. |
