Feeding wild birds is one of the most popular forms of interaction between wild animals and humans. This relatively simple method can be applied in the educational process in primary schools through active learning in the field, which serves to improve the pro-environmental attitudes of pupils. The aim of the research was to verify the effect of winter bird feeding on the behavior and knowledge of pupils in selected primary schools. We were interested in whether there are differences between respondents who feed birds in winter and those who do not in terms of their gender, grade, place of residence (apartment, house), and school location. We were also interested in the motivation to feed birds and its origin. The results of our research confirmed that winter bird feeding has a positive effect on respondents’ knowledge (p = 0.0101). Pupils attending schools in village areas had a higher tendency to feed birds (p = 0.0005). This was similar for housing type, as respondents living in houses were more likely to feed birds (p = 0.0011). The effect of gender was negligible in our research (p = 0.2965).