I don’t have feathers, do I?” The boy shrugged. “Some birds don’t have feathers.” Beneath his mask, Sebastian frowned. “All birds have feathers. Feathers are what makes them birds.” “What about the duck-billed platypus?” the boy asked. “That doesn’t have feathers. It has fur. What kind of duck has fur?” “The duck-billed platypus isn’t a duck. It’s a platypus.” “What’s a platypus?” “It’s a monotreme,” Bennet said miserably. “A mammal that lays eggs.” “Oh,” said the boy.