An adult chicken weighs 8 to 10 pounds, with females called hens and males called roosters. They can live 10 to 15 years eating seeds, worms, insects, grains and snails. Baby chickens hatch from eggs laid by their mother, called a hen, who produces 250 eggs per year. The mother chicken cares for the chicks for 1 to 3 months, feeding them whatever she provides.