Monitor Lizard
When the princes returned home, their story was narrated before Lord Kṛṣṇa. Lord Kṛṣṇa is the friend of all living entities. Therefore, after hearing the appeal from His sons, He personally went to the well and easily got the great lizard out simply by extending His left hand. Immediately upon being touched by the hand of Lord Kṛṣṇa, that great lizard gave up its former shape and appeared as a beautiful demigod, an inhabitant of the heavenly planets. His bodily complexion glittered like molten gold. He was decorated with fine garments, and he wore costly ornaments around his neck.
(Krsna Book 63)