Presence of domestic pigs or cross-bred animals
The hunter’s questionnaire assessed the observation of contacts between both populations in hunting areas and the presence of domestic pigs or cross-bred individuals in hunting grounds during the last 10 years. For the former, a list of criteria suggesting potential hybridization features were provided including white spots in the fur, shape of the body, short snout, falling ears, thick fat layer and large litters. The questionnaire requested to qualitatively characterize the frequency of observation as “Low” if only one observation reported, “Medium” if less than 5 observations were reported and “High”, if more than 5 observations were reported.