Fork-tailed Storm-Petrel vs Leach's Storm-Petrel

Fork-tailed Storm-Petrel and Leach's Storm-Petrel are both small, pelagic seabirds with similar habits, but can be distinguished by tail shape and plumage. The Fork-tailed Storm-Petrel has a distinctive forked tail and a bluish-gray coloration, while Leach's Storm-Petrel has a more deeply forked tail and a darker, more sooty appearance.

1. Tail Shape: Look for the tail shape; Fork-tailed Storm-Petrel has a moderately forked tail, while Leach's Storm-Petrel has a deeper fork. 2. Plumage Color: Note the overall color; Fork-tailed is bluish-gray, and Leach's is darker and sootier. 3. Group Size: Fork-tailed is often in smaller groups, whereas Leach's can be in larger flocks. 4. Location: Consider the location; Fork-tailed may be closer to shore in northern areas.

Both species are similar in size, but Leach's Storm-Petrel may appear slightly larger due to its longer wings and tail.

Fork-tailed Storm-Petrel is bluish-gray overall, while Leach's Storm-Petrel is darker, with a more sooty appearance. The tail of the Fork-tailed is moderately forked, whereas Leach's has a deeper fork.

Both species are pelagic and often seen hovering or pattering on the water's surface. Fork-tailed Storm-Petrel is more likely to be seen in small groups, while Leach's Storm-Petrel can be seen in larger flocks.

Both species are pelagic and can be found over continental shelf waters. Fork-tailed Storm-Petrel may be more commonly seen closer to shore in northern habitats.

Vocalizations are not typically used for field identification of these species.