Above: Suparṇa's Citadel shown with a Garuda and one in back“In Buddhist mythology, the Garuda (Pāli: garuḷā) are enormous predatory birds with intelligence and social organization. Another name for the Garuda is suparṇa (Pāli: supaṇṇa), meaning "well-winged, having good wings". Like the Naga, they combine the characteristics of animals and divine beings, and may be considered to be among the lowest devas.
The exact size of the Garuda is uncertain, but its wings are said to have a span of many miles. This may be a poetic exaggeration, but it is also said that when a Garuda's wings flap, they create hurricane-like winds that darken the sky and blow down houses. A human being is so small compared to a Garuda that a man can hide in the plumage of one without being noticed (Kākātī Jātaka, J.327). They are also capable of tearing up entire banyan trees from their roots and carrying them off.
Garudas are the great golden-winged Peng birds. They also have the ability to grow large or small, and to appear and disappear at will. Their wingspan is 330 yojanas (one yojana being 8 miles long). With one flap of its wings, a Peng bird dries up the waters of the sea so that it can gobble up all the exposed dragons. With another flap of its wings, it can level the mountains by moving them into the ocean.” Wiki
Below: Garuda's Outpost in black and white