Sarah L. Thomson is a former children's book editor who is now a full-time children's book writer. She has written more than thirty books across many genres, including Ancient Animals- Terror Bird and Ancient Animals- Saber-Toothed Cat. She lives in Portland, Maine. Andrew Plant is a trained zoologist with a strong interest in paleontology. He has illustrated more than one hundred books for children, including Living Fossils- Clues to the Past; A Platypus, Probably; Ancient Animals- Terror Bird; and Ancient Animals- Saber-Toothed Cat. Andrew lives in Melbourne, Australia.