Preschool shall offer children instructions in biology and this includes teaching about nature's different cycles. In this study, we want to highlight how biology teaching and the use of picture books can be linked. The purpose of our study is to highlight how picture books can illustrate cycles of nature in preschool teaching. The cycles of nature have been limited to the cycle of carbon and water. The method that has been used is a content analysis of text and pictures. 16 picture books published between the year 2000-2021 have been analysed. The analysis shows that the carbon cycle could be illustrated by different categories. The water cycle emerged through the category of water movements. The results showed that the cycles of carbon and water can be made visible in both text and pictures. The images were able to expand the content beyond what the text said and make the cycle of carbon and water visible. When the cycles were illustrated in the text, this was often reinforced by a picture. The results also show that concepts are not common in picture books. It is also shown that the cycle of carbon and water can be illustrated in picture books with both anthropomorphic content and those without. The conclusions drawn from the result are that picture books can be used to illustrate the cycle of carbon and water. It is however necessary that the preschool teacher has subject knowledge in biology in order to make this content visible in teaching.