This study investigated which plants and animals Swiss children found most attractive and evaluated the effect of an educational programme on children's preferences for species. More than 4000 pupils (8-16 years old) from 248 classes participated in the study. Possible effects of the programme were studied with the help of questionnaires using a pretest/post-test design with an experimental group that participated in the programme and a control group that did not. Before the start of the programme most children found decorative or garden species among plants, and pets and exotic species among animals, most attractive. However, the more wild plants and animals children noticed in their local environment and could name, the more did they appreciate these organisms. Moreover, the more additional wild plants the children noticed due to the programme, the higher was the increase in their appreciation of these species. This supports the hypothesis that children may appreciate animals other than pets and exotic species and even inconspicuous wild plants if they know them.