This article aims to participate in filling the gap of knowledge in mountain sports participants' perception of wildlife disturbance. In a context of growing popularity of these activities and, consequently, of increase of visitors in the Northern French Alps, we examines visitors of protected areas attitudes toward disturbance and widlife tranquility areas. The quantitative survey focused on ski tourers and hikers (N=2 050), it shows that respondents who witnessed disturbance, such as flight response from wildlife, are much more likely to state that they might be a source of disturbance. Additionaly, results show that attitudes and values towards wildlife and disturbance are more important than sociodemographic or activity related characteristics to explain perception of self-caused disturbance or avoidance of tranquility areas.