Book excerpt: Why did the top fall off Mt Cook? Do male kākāpō ever get lonely? Why do sheep like to 'follow the leader'? Are there glaciers in the North Island? What did Māori use for chewing gum? Are there moose in Fiordland? . . . and why can't kiwis fly? Why Can't Kiwis Fly? is a succinct, quirky and informed collection of questions and answers about New Zealand's natural history. Crammed full of fascinating, fun and sometimes challenging facts, it's a lively, bite-sized introduction to our natural world.