CHKNI; CHICKEN; DOMESTICATED FOWL KEPT FOR ITS EGGS AND VARIOUS MEATS SUCH AS DRUMSTICKS; THE CHICKEN (GALLUS GALLUS DOMESTICUS) IS A DOMESTICATED FOWL, A SUBSPECIES OF THE RED JUNGLEFOWL. AS ONE OF THE MOST COMMON AND WIDESPREAD DOMESTIC ANIMALS WITH A POPULATION OF MORE THAN 24 BILLION IN 2003,[1] THERE ARE MORE CHICKENS IN THE WORLD THAN ANY OTHER SPECIES OF BIRD. HUMANS KEEP CHICKENS PRIMARILY AS A SOURCE OF FOOD, CONSUMING BOTH THEIR MEAT AND THEIR EGGS.