Employing the theoretical framework of ecological psychology, this article uses observations of children in a Danish forest preschool to identify features of the forest that the children engaged with frequently, with a particular focus on affordances of "small animals." The article describes children's fascination and interactions with creatures like insects, worms, snails and frogs, and how activities in varied green settings provide important opportunities for young children to handle small forest creatures, talk about them with other people, and learn to care for them. We discuss how interactions with small creatures may contribute to children's long-term disposition to protect forests and biodiversity, and how to increase opportunities for children to engage with small animals in the everyday settings of their lives. We conclude that these affordances of creatures may prepare young children to understand and support Sustainable Development Goal #15 (SDG #15), which calls to people to protect terrestrial ecosystems and prevent biodiversity loss.