Fun fact: The author of SPIROCHETE also wrote The Lamb and the Butterfly with Eric Carle. https://www.amazon.com/Lamb-Butterfly-Arnold-Sundgaard/dp/0545443261/ref=sr_1_1?dchild=1&qid=1606338848&refinements=p_27%3AArnold+Sundgaard&s=books&sr=1-1