Meeting the nutritional and behavioural needs of geladas in zoos requires innovative approaches to grass provision, as their highly specialised grazing adaptation cannot be met by conventional primate diets.
Grazing is so central to gelada biology that failing to provide adequate grass creates both nutritional deficiency and severe behavioural deprivation. A gelada denied the opportunity to spend hours processing grass with its hands and teeth cannot express a fundamental component of its species-typical behaviour. Fruit-heavy diets cause dental erosion through sugar exposure and contribute to obesity in animals that evolved on a low-calorie, high-fibre grass diet. The physical posture of grazing — sitting upright and reaching downward — is also a natural default posture that should be expressible throughout the day. High-welfare gelada management treats appropriate nutrition and feeding behaviour as inseparable priorities.