Chickens (Gallus domesticus) are domestic birds that cannot fly. There are over 150 different breeds of chicken that come in various colors, patterns and sizes. The chicken is believed to have descended from the wild Indian and south-east Asian Red Junglefowl which is biologically classified as the same species. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.