(In reply to
answer by K Sengupta)
A man has : 2 legs, 1 head, 2 ears and 2 hands
A horse has: 4 legs, 1 head, 2 ears and 0 hands.
Thus, a man riding a horse together comprise:
6 legs, 2 heads, 4 ears, and 2 hands,
Consequently, the required answer to this riddle is: a man riding a horse.