Its and especific race, cllaed Spainsh brave bulls, one of the most powerfull animal of the world. Romans did in ancient times fights of brave bulls againts lions, tiger, elephants . the fights lasted so little time that people complained about. There isnt more powerfull animal in nature, they can dump a car from a goring. Your pic saw me a cow whit balls,not the direct descendant of the extinct aurochs. What you see are bulls with only 4 years, if you saw the size reaches a stallion of these bulls you would realize.