The llama (Lama glama) is a domesticated South American camelid belonging to the family Camelidae. Native to the Andean highlands of Peru, Bolivia, Ecuador, Chile, and Argentina, it thrives at elevations between 3,000 and 5,000 meters where temperatures can swing from freezing nights to intense solar heat. Llamas are adapted to sparse, rocky grasslands and puna ecosystems, feeding on tough grasses, shrubs, and occasional cactus pads. Morphologically, they possess a long, curved neck, a split upper lip, and a dense double‑coat of fine under‑hair topped by coarse guard hairs that provide insulation and water‑repellency. Adult males stand 1.7–1.8 m at the shoulder and weigh 130–200 kg, while females are slightly smaller. Unlike their wild relatives, the guanaco and vicuña, llamas have been selectively bred for fiber, meat, and pack‑carrying abilities for over 4,000 years. The species is classified as Least Concern by the IUCN, reflecting its large domestic population of several million individuals, though wild‑type populations are fragmented and number fewer than 10,000. Conservation efforts focus on preserving genetic diversity, protecting high‑altitude habitats, and supporting sustainable pastoral practices that maintain both ecological balance and cultural heritage.

Llamas are highly social animals that live in stable herds ranging from a few individuals to over 30 members. Herds are organized around a dominant male, several breeding females, and subordinate males, with a clear hierarchy maintained through body postures, ear positioning, and occasional sparring. They are primarily diurnal, spending daylight hours grazing and resting, while seeking shelter during harsh weather or nighttime predators. Territorial ranges are fluid; groups overlap but defend preferred feeding patches by low‑intensity chases and vocalizations. Communication relies on a repertoire of sounds—soft hums to locate herd mates, sharp alarm calls when predators approach, and a distinctive “clucking” during maternal interactions. Visual signals such as head‑butting, leg kicking, and tail flicking convey aggression or submission. Llamas also use scent marking, depositing glandular secretions on rocks to signal individual identity and reproductive status.

Llamas are non‑ruminant, pseudo‑ruminant herbivores that rely on a foregut fermentation system to extract nutrients from fibrous plant material. Their diet consists primarily of grasses, sedges, and low‑lying shrubs, supplemented with leaves, bark, and occasional cactus pads in arid zones. An adult llama consumes roughly 2–3 % of its body weight in dry matter daily, equating to 2.5–5 kg of forage depending on season and activity level. They are efficient water users, obtaining up to 80 % of their hydration from moisture in plants, which enables survival in high‑altitude deserts where free water is scarce. Llamas graze in a selective manner, preferring tender shoots and avoiding toxic alkaloid‑rich species; they possess a split upper lip that aids in precise plant selection. Feeding is typically spread throughout daylight hours, with short resting bouts. In managed settings, supplemental hay, alfalfa, and mineral blocks are provided to meet nutritional requirements, especially during winter when pasture quality declines.

Sexual maturity in llamas occurs at 2–3 years for females and 3–4 years for males, though successful breeding often waits until individuals reach full body condition. The breeding season is seasonal in the Andes, typically aligning with the onset of the rainy period between October and December, when forage quality improves. After a single copulation, the gestation period lasts 350 ± 10 days, one of the longest among terrestrial mammals. Llamas give birth to a single cria, which weighs 5–7 kg at birth and can stand within an hour. The mother nurses the cria for 4–6 months, providing nutrient‑rich milk that contains high levels of antibodies. Creche behavior is rare; however, older herd members may assist by guarding the newborn. Weaning occurs at about 6 months, after which the juvenile gradually integrates into the herd’s foraging activities. Lifespan and reproductive output are enhanced under good nutrition and low parasite loads, allowing females to produce a cria every 1.5–2 years.

The IUCN lists the llama as Least Concern, largely because its domesticated population exceeds 7 million worldwide, supporting economies in the Andes and beyond. However, wild‑type llama populations, represented by feral or semi‑wild groups, face several pressures. Habitat loss from expanding agriculture, mining, and infrastructure fragments the high‑altitude grasslands essential for forage. Climate change intensifies temperature extremes and reduces precipitation, diminishing the availability of nutritious grasses. Predation by pumas (Puma concolor) and Andean foxes (Lycalopex culpaeus) affects vulnerable crias, while disease outbreaks such as mange (Sarcoptes scabiei) and parasitic infections can cause significant mortality in poorly managed herds. Over‑exploitation for meat and fiber in some regions reduces genetic diversity, and unsustainable breeding practices may lead to inbreeding depression. Conservation programs focus on preserving traditional pastoralist practices, establishing protected corridors, and conducting genetic monitoring to maintain healthy, resilient llama populations both in domestic and wild contexts.

• Llamas can carry up to 25 % of their body weight for several miles, making them valuable pack animals in mountainous terrain.
• Their unique humming vocalization can travel up to 3 km, helping herd members locate each other across steep valleys.
• Llamas have a three‑chambered stomach that ferments cellulose more efficiently than true ruminants, allowing them to thrive on low‑quality forage.
• The wool of a single llama can yield up to 5 kg of fiber annually, which is prized for its softness, warmth, and hypoallergenic properties.
• Llamas possess a natural resistance to many parasites common in livestock, a trait that has been studied for potential applications in veterinary medicine.