Because of his strength, Motobaro is called a brutal beast who is capable of tearing holes even in village dams with his horns, which people call them the Heart-smashing Horns (心臓破りの角 Shinzou-yaburi no Tsuno). They were the reason that Duval was able to escape the Marines. He is so strong that he is still capable of breaking straight out of a cage and crushing an opponent even if his horns do not reach them.
One Piece Wiki EN