Sam Falconer's detailed illustrations take science and nature topics and make them easy to comprehend. His clients include The Guardian, The Independent, The Times, the BBC, Radio Times, National Geographic, Nature, Scientific American, Harvard Magazine, and New Scientist. He has illustrated two other children's books, Water Cycles and Life Cycles, for DK. Dr Anthea Lacchia is a writer specialising in science and nature, and a science communicator. Trained as a geologist with a PhD in palaeontology, she has worked in journalism and academic research. Her writing has appeared in The Guardian, Nature, The Irish Times, The Journal.ie, and Research Professional, among other outlets, and she is a regular contributor to DK's science and nature books for children and adults.