Ever hear of the pink-headed duck? What about Romeo the Frog, a type of rare water frog who found his mate with the help of an online dating photo? Our world is full of quirky, interesting animals who make our planet a vibrant, diverse place to live. This illustrated guide celebrates them by providing you with fun facts, conservation success stories, and profiles of people working hard to find and protect the rarest of these species, which include the European hamster, the Crau plain grasshopper, the cave salamander, and the Mallorcan midwife toad.