In 2004, BirdLife International split the Spectacled Petrel, Procellaria conspicillata, from the White-chinned Petrel, Procellaria aequinoctialis, which had been considered conspecific or even a color morph.
petrel | Snow Petrel | Zino's Petrel | Wilson's Storm Petrel | Hacienda San Antonio de Petrel | Antarctic Petrel | Northern Giant Petrel | Spectacled Owl | Pycroft's Petrel | Fea's Petrel | Deserta's Petrel | Cape Petrel | Bulwer's Petrel | Wilson's Storm-Petrel | Wilson's Petrel | White-faced Storm Petrel | White-chinned Petrel | White-bellied Storm Petrel | Tristram's Storm-petrel | Storm petrel | Spectacled Thrush | Red-spectacled Amazon | Pincoya Storm Petrel | Magenta Petrel | Leach's Storm-petrel | Leach's storm-petrel | giant petrel | Collared Petrel | Black-capped Petrel | Bermuda Petrel |