Sennenryu

A Sennenryu is an animal in the world of One Piece. It is a dragon, or a reptile of some sort, capable of flight. It is noted for its extremely long lifespan, as it can live up to 1000 years (the name means "Thousand Year Dragon"). They come from Warship Island's mostly submerged Dragons Nest.

They only appear in the anime only Warship Island Arc but are also referenced in the Ocean's Dream arc.