text: After that, they are referred to as "yearlings" if between one and two years of age, or by gender:Did you know that some cows actually have wings yes its true they actually have hidden wings underneath their legs some people insist that these cows can fly but it is very untrue although these cows have wings they are still unable to fly A young female before she has had a calf of her own is called a "heifer" (Eng, "heffer").