In May-June 2021 a herd of wild Asian elephants made global headlines when they trekked hundreds of km into areas where elephants had been absent for centuries, mobilizing a response of unprecedented scale. Here, we analyze the movement attributes and body condition of these elephants to understand this unusual behavior and its implications for megafauna conservation in the Anthropocene. We propose that these movements are a form of partial and irruptive nomadic behavior, although the data is also compatible with a failed attempt of dispersal. In their path to Kunming, the elephants made unusual habitat choices, using landscapes with higher nightlight intensity, and moving close to towns and villages, while avoiding areas with high forest cover, which we interpret as habituation to feeding on crops and lack of fear of people. Fifteen months after starting their journey, the elephants showed high body condition scores and had successfully delivered two babies, both indicators of good health, suggesting that their decision to leave their previous home range had paid off. In China, we recommend an elephant conservation strategy founded on area-based and area-specific measures, including protected areas, landscape connectivity, and the mitigation of human-elephant conflicts, as well as preparedness for expectable population range expansions, potentially on the scale of hundreds of km, in the coming decades. Our study highlights the ecological and behavioral plasticity of elephants and the importance of integrating movement ecology in conservation planning, especially for wide-ranging species.