One morning in 2024, Armando Schlindwein found an orange-bearded monkey ... Deforestation was eating away at its limited domain, and the monkey was trying to find an escape route for its family.

The monkey, a Groves' Titi, listed as "critically endangered" by the International Union for Conservation of Nature (IUCN), had ventured far from its fast-shrinking home on a hill in a small patch of ...