This book explores current research on young children's beliefs and knowledge about the biological world - otherwise known as 'folkbiology'. Contributors discuss factors that shape the development of folkbiological knowledge, as well as possible interventions designed to counteract cognitive biases that can interfere with the development of scientifically informed reasoning about natural phenomena. Taken together, the papers provide insights into the contributions of cognitive biases to the development of biological misunderstandings and into the life experiences and contexts that can contribute to or impede accurate learning of biological concepts. As part of a wider literature, the insights provided by the authors are relevant to the design of educational experiences that will foster children's exploration and further their understanding of life science ideas. The chapters in this book were originally published as a special issue of Early Education and Development.