Due to envy, many asuras describe Kṛṣṇa to be like a black crow or an incarnation of a hair. Śrī Caitanya Mahāprabhu told Sanātana Gosvāmī how to counteract all these asuric explanations of Kṛṣṇa. The word kāka means crow, and keśa means hair. The asuras describe Kṛṣṇa as an incarnation of a crow, an incarnation of a śūdra (a blackish tribe) and an incarnation of a hair, not knowing that the word keśa means ka-īśa and that ka means Lord Brahmā and īśa means Lord. Thus the word keśa indicates that Kṛṣṇa is the Lord of Lord Brahmā.
Some of Lord Kṛṣṇa’s pastimes are mentioned in the Mahābhārata as mauṣala-līlā. These include the stories of the destruction of the Yadu dynasty, Kṛṣṇa’s disappearance, His being pierced by a hunter’s arrow, the story of Kṛṣṇa’s being an incarnation of a piece of hair (keśa-avatāra) as well as mahiṣī-haraṇa, the kidnapping of Kṛṣṇa’s queens. Actually these are not factual but are related for the bewilderment of the asuras, who want to prove that Kṛṣṇa is an ordinary human being. They are false in the sense that these pastimes are not eternal, nor are they transcendental or spiritual. There are many people who are by nature averse to the supremacy of the Supreme Personality of Godhead, Viṣṇu. Such people are called asuras. They have mistaken ideas about Kṛṣṇa. As stated in the Bhagavad-gītā, the asuras are given a chance to forget Kṛṣṇa more and more, birth after birth. Thus they make their appearance in a family of asuras and continue this process, being kept in bewilderment about Kṛṣṇa. Asuras in the dress of sannyāsīs even explain the Bhagavad-gītā and Śrīmad-Bhāgavatam in different ways according to their own imaginations. Thus they continue to remain asuras birth after birth.