The Aries and Taurus symbols go together like salt and pepper, P's and Q's, ketchup and mustard...just pick any Yin and Yang common match up. Both represent hoofed animals, ungulates, for power and with horns.
Coincidentally cows are in second place, in both the Eastern and Western Zodiacs. The Year of the Ox follows in second, following the first Year of the Rat as does Taurus follow in 2nd as the month of the Ox, following the first sign of Aries. Coincidence?