Wildlife tourism experiences are often promoted for their ability to enhance visitors' conservation knowledge, attitudes and behaviour; yet, studies exploring the long-term influence of such experiences are rare. This research explores the impact of a wildlife tourism experience and post-visit support on families' adoption of conservation practices following their visit. In Stage 1, barriers and benefits associated with six conservation practices were identified and incorporated into the design of post-visit action resources. Two hundred Australian families visiting Mon Repos turtle rookery in Queensland, Australia, were assigned to either a treatment group (given post-visit support) or a control group (no support). Three months after their visit, families in the treatment group were significantly more likely to report changes in their conservation knowledge; their attitudes towards protecting wildlife and the natural environment; and the frequency with which they picked up litter. Treatment families also adopted significantly more conservation practices than the control group. Implications for wildlife interpretive practice and visitor management at wildlife tourism sites are discussed. (Contains 4 tables and 1 figure.)