What On Earth is That? is a story in rhyming text about a pangolin – the world's least-known yet most-trafficked mammal. The author's son Luke invites young readers or listeners on a journey asking various animals what they think the odd-looking creature is that he and a friend have unearthed. In the process, it's revealed just what extraordinary and endearing animals pangolins are and how deserving they are of our protection as an endangered species. A section at the end of the book provides some interesting facts on pangolins and shows the work being done to fight for their survival.