Wilson's Storm-Petrel vs European Storm-Petrel

Wilson's Storm-Petrel and European Storm-Petrel are both small, dark seabirds but differ in key features. Wilson's Storm-Petrel is slightly larger and has a distinctive white rump patch, while the European Storm-Petrel is smaller with a less contrasting rump. Observing their flight behavior and habitat preferences can also aid in identification.

Look for the white rump patch on Wilson's Storm-Petrel, which is a reliable field mark. Note the flight pattern: Wilson's tends to patter on the water, while European flies more erratically. Consider the habitat: Wilson's is more widespread, while European is more localized to the northern Atlantic.

Wilson's Storm-Petrel is slightly larger than the European Storm-Petrel.

Wilson's Storm-Petrel has a prominent white rump patch and a more uniform dark brown body. European Storm-Petrel has a less contrasting rump and may appear more uniformly dark.

Wilson's Storm-Petrel often 'walks' on water, pattering with its feet while feeding. European Storm-Petrel tends to fly lower and more erratically over the water.

Wilson's Storm-Petrel is a generalist, found in a wide range of pelagic environments. European Storm-Petrel is more often found in northern Atlantic waters.

Vocalizations are not typically used for field identification between these two species.