Srimad Bhagavatham speaks of a king named Yadu who heard of 24 gurus from an avadhu:tha. They are Earth, air, sky, fire, Sun, pigeon, python, sea, moth, elephant, ant, fish, Pingala, arrow-maker, playful boy, moon, honeybee, deer, bird of prey, maiden, serpent, spider, caterpillar, and water. Anything or anyone who awakened knowledge of eternal
Source: JIVA Shamshabad News