W. E. Hardenburg, The Putumayo, The Devil's Paradise… (1912)
“ We soon perceived, however, that our Cionis were used to their job, for they guided the flying canoe with the greatest skill as it continued its wild progress down the swift-running river. One of them, the popero, or pilot, always sits on the high, narrow seat in the stern, and, paddle in hand, steers the canoe and from time to time directs the manoeuvres of the other, known as the puntero, who generally stands in the bow and calls out the obstacles, such as logs, stumps, etc, to the popero, in case the latter cannot see them from where he is seated. ”
