A fundamental problem for establishing appropriate strategies for the conservation and management of the jaguar population is the lack of detailed studies about its ecology. One of the world's least-known feline species, the jaguar poses mostly questions: How does it use its environment? What territory is required to sustain a single individual? Is there a difference in the territory needed by males and females? What is their population density? What is their social organization? When do jaguars reproduce? What are their main prey? We hope to answer these questions, and more, with our study.

6:00 am

About six in the morning, the first rays of sunlight foretell dawn. As the day goes on, the jungle comes to life. The warbling of the birds surrounds us; particularly noticeable is the song of the chachalacas. Pancho stops. He has finally found a fresh track that looks like a jaguar's. We quickly let the dogs out. Sombra runs around in circles trying to find the scent. Suddenly her howling tells us she has found it, and she dashes off madly, running through the jungle with the other dogs at her heels howling in unison. My heart seems to jump out of my chest with its pounding. Javier flies after the dogs, trying to keep as close as possible to make sure they don't get lost or the great cat doesn't hurt them. We try to keep up