For the type of book this is, it's amazing and must have taken years to collect the information and stories within. The author has spent years visiting lighthouses and has owned cat for decades. Of course, cats were one species kept as pets with jobs at lighthouses. There were dogs, mules, horses, cows (for milk), chickens, geese, goats, sheep and others. Then there are the bird stories about wild birds and how they are attracted to lighthouses. There are stories of sea life, reptiles, rats, snakes, and more. The stories are told in paragraphs or pages, not separate stories as chapters. The book is organized loosely by subject or animal. It's more than you imagined to learn about lighthouses, their keepers, and animals, both pets and wild.