High above the Kinabatangan River in Malaysian Borneo, a mother proboscis monkey cradles her sleeping infant, her gaze fixed beyond the frame as our small boat drifted quietly below. The baby rests weightless in her arms, unaware of the fragile world it has been born into. Proboscis monkeys exist nowhere else on Earth. They depend on the riverine forests that lace Borneo’s waterways—forests that are disappearing at an alarming rate. From the water, the contrast is stark: stretches of lush canopy interrupted by vast oil palm plantations that press tightly against the remaining habitat. What was once a continuous forest is now fragmented into narrow corridors, isolating troops and limiting access to food and safe nesting trees.