Paíño de Tristram vs Petrel de las Kermadec

Tristram's Storm-Petrel and Kermadec Petrel can be distinguished by their wing and tail features. Tristram's Storm-Petrel has long, pointed wings with a notched tail, while Kermadec Petrel shows a white flash on the underwing and white shafts on the upper side of the primaries. These differences are key when observing them in flight.

Look for the white flash on the underwing and white primary shafts to identify Kermadec Petrel. Note the long, pointed wings and notched tail of Tristram's Storm-Petrel. Observe behavior: Kermadec Petrel may be seen harassing other birds, while Tristram's Storm-Petrel is more likely to be seen feeding at the ocean surface.

Tristram's Storm-Petrel has lighter underparts and lacks the distinctive white flash on the underwing that Kermadec Petrel displays. Kermadec Petrel also has white shafts on the upper side of the primaries, which are absent in Tristram's Storm-Petrel.

Tristram's Storm-Petrel is nocturnal in its colony attendance and feeds by seizing prey from the ocean surface. In contrast, Kermadec Petrel exhibits kleptoparasitic behavior, stealing food from other seabirds.