Are feathers the main identifying characteristic of a bird?

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Yes, indeed! It is not wings, or beaks or the ability to lay eggs that make a bird a bird. Some mammals lay eggs, and have beaks (like the duck-billed platypus) and some others can fly (like the bat). Reptiles like snakes and crocodiles also lay eggs. However it is feathers that differentiate a bird from other creatures. Birds are the only creatures that possess feathers.