Raising Attacus atlas caterpillars is a rewarding process, and despite their impressive size, they are surprisingly manageable when their basic needs are met. Newly hatched larvae are active feeders from day one and settle quickly when provided with fresh, tender foliage. They grow rapidly through several instars, each stage becoming progressively thicker, greener, and more heavily textured, eventually reaching the iconic chunky, wax‑dusted appearance of late‑stage Atlas larvae.
 
In captivity, the key to success is fresh food, stable humidity, and excellent airflow. Caterpillars can be kept in mesh cages, plastic tubs with ample ventilation, or pop‑up enclosures. Overcrowding should be avoided—these larvae are large, produce significant frass, and benefit from space to move and feed without constant contact. Regular cleaning and dry conditions underfoot help prevent mould and bacterial issues, especially in later instars when waste output increases dramatically.
 
Diet is straightforward: Atlas caterpillars accept a wide range of host plants, including privet, lilac, cherry, apple, guava, and citrus, though privet is often the most reliable and widely used in the UK. Stems should be kept in water to maintain leaf freshness, with the container securely blocked to prevent drowning. As they grow, their appetite becomes enormous, and food must be replaced frequently to ensure constant access to crisp, hydrated leaves.
 
Humidity should be kept moderate, avoiding both extremes—too dry and they struggle to moult cleanly; too wet and they become prone to disease. Light misting of the enclosure walls (not the caterpillars themselves) is usually sufficient. Once fully grown, larvae will wander in search of a pupation site. Provide dry leaf litter or paper towel at the base of the enclosure so they can spin their large, papery cocoons undisturbed.