Biografía del autor
Sara Levine is a veterinarian, author, and educator who loves animals, books, and books about animals. Her picture books include Flower Talk, Bone by Bone, Fossil by Fossil, and Tooth by Tooth, which received the AAAS/Subaru SB&F Prize for Excellence in Science Books and was recognized by Bank Street College as a Best Children's Book of the Year.

Marta Álvarez Miguéns is a self-taught illustrator who lives in Spain. She has illustrated many books, including Dinosaur Lady and Shark Lady, which was named a Best Children's Book of the Year by Parents magazine and one of Twelve Books for Feminist Boys and Girls by the New York Times. www.martalvarez.com