Townsend's Shearwater, Puffinus auricularis, is a rare seabird of the tropics from the family Procellariidae. Its relationships are unresolved. Its closest relatives are probably, but not certainly, the Hawaiian Shearwater (Puffinus newelli) and possibly the Manx Shearwater (Puffinus puffinus). This species breeds around Cerro Evermann on Isla Socorro in the Revillagigedo Islands, Mexico. The main threat to this species comes from feral cats introduced to Socorro in the early 1970s.