Winner of the £10,000 Royal Society’s Young People’s Book Prize 2016, which champions the best science books for under-14s.
Macaulay, who was announced as the winner at a ceremony in Cardif, was selected by a panel of child judges from a shortlist of six books. The shortlist was picked by a panel of adult judges, chaired by Professor Dame Julia Higgins.
Higgins said: “This book isn’t just dry pages about what engineering is. It’s a very exciting story about a sloth that has to get somewhere and in order to get to where he’s going he has to build levers, he has to build bridges. Each of the pages is about how he designs a solution to a problem - just what an engineer must do.”