Not a conquisatador, but a Jesuit priest, Antonio Ruiz de Montoya, writes in The Spiritual Conquest about jaguars in the Upper Plata (from the 1610s, he refers to them as tigers but we know better now)

"The natives have learned that this animal avoids human urine like death. A tiger pursued an Indian in a forest near where I lodged. Though he shouted we could not hear him. He climbed a tree, and the tiger crouched at its food waiting for him to come down. The Indian flung down heavy branches to drive it off, but it would not budge. He then resorted to the simple means just mentioned and the tiger instantly fled at the smell. It seeks out the poorest meat: if there is a Spaniard, a black, and an Indian, it attacks the black first; if there are only blacks, it chooses the oldest and worst smelling."

As long as it doesn't smell of urine, one would assume.

It's a not a conquistador per se, but the missionaries would often describe wildlife in these manners as well, as the reports were being read by those funding these missions in Europe, who were more likely to fund when they liked what they read. This unfortunately makes some of these reports quite unreliable.