What is Bird ?
Bird is (noun) 1. an animal with wings and feathers Most birds can fly, but penguins can’t. She keeps a little bird in a cage. a little bird told me someone told me the secret, but I can’t tell you who it was a bird in the hand is worth two in the bush be satisfied with what you have, rather than hoping for something better which may never come. early 2. a person, especially a woman (informal.) She’s a funny old bird. 3. a girl (offensive) Who’s that new bird in the accounts department? Did you see the bird he was with last night?
source: Easier English, Student Dictionary Upper Intermediate Level