There are "bulls" and there are "cows". Sub categories will include the words "steers" and "heifers"....... Yes, we all have seen a herd in a field and said "hey, look at those cows".....but as a generic descriptor, the accurate term would be the word "cattle". There are meat cattle, dairy cattle, working cattle and the category that I call "meadow ornaments". These not only encompass your plain ole "Bessie" type cow that "was just too cute to put in the freezer", but the new-ish (to this country) miniature cattle breeds. In the cattle industry, the (desirable) dimensions of the various breeds can vary greatly. From the Zebu (mini) at 400-600 lbs., to the Chianina (oxen) which can go over 3,500 lbs. there are a lot of choices. Having dealt with a few of the different breeds, I can attest that if any variety really wants defeat a gate,fence (or you) they are almost always successful to some degree. Because even a "small" (500 pound) hunk of angry meat, wrapped in leather (and often equipped with horns) can be a formidable opponent to most anything. :wink:
As to the perceived size disparities.....we are taking much better care of our animals than used to be the norm. A 25 year old horse is not at all uncommon...(I recently saw an article concerning a 40 year old).....and a 5-6 foot tall cow/bull is not unheard of. :idea: