Not because we turn them all into hamburgers, mean that cows are not a special animal, like all the rest. There are hundreds of cow breeds and they are special in their own way. "The average weight for mature Bazadais cows is 750kg (1650lbs) and average height is 1.40m (55 inches)" and "The gestation period of a Belgian Blue is 280 - 285 days. The animals are large with bulls average 900-1,200 kg and cows averaging 700 to 850 kg." [1] This is a page with pictures of a wide range of cow breeds.