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…Vṛndāvana was always absorbed in the thought of Kṛṣṇa. Everyone remembered His pastimes and was constantly merged in the ocean of transcendental bliss. But the material world is so contaminated that even in Vṛndāvana the asuras or demons tried to disturb the peaceful situation.
One demon named Ariṣṭāsura entered the village like a great bull with a gigantic body and horns, digging up the earth with his hooves. When the demon entered Vṛndāvana, it appeared that the whole land trembled, as if there were an earthquake. He roared fiercely, and after digging up the earth on the riverside, he entered the village proper. The fearful roaring of the bull was so piercing that some of the pregnant cows and women had miscarriages. Its body was so big, stout and strong that a cloud hovered over its body just as clouds hover over mountains. Ariṣṭāsura entered Vṛndāvana with such a fearful appearance that just on seeing this great demon, all the men and women were afflicted with great fear, and the cows and other animals fled the village.
The Hare Krishna Movement 