Gandaberunda or Bherunda is a two-headed bird in Hindu mythology, a form assumed by the Hindu deity Vishnu. It is believed to possess immense magical strength. Vaishnava traditions hold it to be a form of Vishnu to fight and subdue Sharabha (In Shaiva traditions, Sharabha is a form of Shiva assumed to pacify Vishnu's Narasimha avatara

This creature comes from certain versions of the story of Narasimha, the man-lion avataram (incarnation) of Vishnu. As most people know the story, Narasimha kills the demon Hiranyakashipu and rescues his devotee Prahlada, and that's the end of it. But a lot of Puranas continue the story as follows: after Narasimha kills Hiranyakashipu, he is still in a state of rage (because his devotee was threatened), and he is destroying everything in his path, starting with the former Asura armies of Hiranyakashipu. The gods are worried that Narasimha will destroy the entire universe in his wrath, so Shiva takes the form of Sharabha, a half-lion, half-bird creature, in order to subdue and pacify the angry Narasimha. That's where most versions end, but some versions of the story go even further: in response to Sharabha, Narasimha creates Ghandaberunda, a two-headed bird creature of his own which overpowers Sharabha, and then everyone calls it a day.