Fork-tailed Storm-Petrel vs Black Storm-Petrel

The Fork-tailed Storm-Petrel is distinguished by its bluish-gray plumage and forked tail, while the Black Storm-Petrel is uniformly dark and has a less pronounced fork in the tail. Both species are pelagic and nocturnal, but their plumage and tail shape are key differences.

Look for the bluish-gray plumage and forked tail of the Fork-tailed Storm-Petrel. The Black Storm-Petrel is uniformly dark with a less pronounced fork in the tail. Observing behavior such as hovering can also help distinguish the Fork-tailed Storm-Petrel.

Both species are similar in size, but the Fork-tailed Storm-Petrel may appear slightly smaller due to its lighter coloration.

The Fork-tailed Storm-Petrel has a distinctive bluish-gray color, whereas the Black Storm-Petrel is uniformly dark. The forked tail of the Fork-tailed Storm-Petrel is more pronounced compared to the Black Storm-Petrel.

Both species are nocturnal and pelagic, often seen foraging in small groups. The Fork-tailed Storm-Petrel is known to hover and dip at the water surface, while the Black Storm-Petrel does not typically exhibit this behavior.

Both species are pelagic and nest on islands, but the Fork-tailed Storm-Petrel is more likely to be seen near continental shelf waters, while the Black Storm-Petrel's range includes the Gulf of California.