The program started with a soundwalk. Instead of a lecture about bird species, the festival offered a guided listening session: everyone loosened electronic devices, sat in a circle, and learned to isolate the rustle of an agouti in the understory, the rattle of a leafcutter ant column, the distant clatter that turned out to be a troupe of howler monkeys waking up. The leader, an ethnobiologist named Marisa, had a quiet voice that invited people to lean in. Children squealed when they heard the sharp metallic click of a motmot; an old fisherman, who had spent decades on the river, closed his eyes and smiled at a call he recognized from his childhood. The lesson was simple and contagious: to protect a place, you first have to hear it properly.