"Cliff Hanger and the Sneezing Zebu" is a book in The Adventures of Cliff Hanger series by Livingston Dangerously. It teaches the letter "Z".
Cliff is hanging from the cliff. When suddenly, he hears a zebu (a kind of bull from Asia) sneezing. Quickly, Cliff reaches into his backpack to pull out his survival manual. Doing this, he learns that he can use the zebu's horns to get off the cliff. He does so, and then asks how he can repay the zebu. The zebu tells him he needs a hankie, so Cliff opens a zippered pocket to get a red one. However, the red makes the zebu go insane, leading Cliff back to his branch.