alma-de-mestre-europeu vs painho-de-cauda-furcada

The European Storm-Petrel and Leach's Storm-Petrel can be distinguished by their flight patterns and tail shape. European Storm-Petrels have a fluttering flight and a square tail, while Leach's Storm-Petrels exhibit a more bounding flight with a forked tail.

Look for the tail shape: European Storm-Petrel has a square tail, while Leach's Storm-Petrel has a forked tail. Observe the flight pattern: fluttering in European Storm-Petrel versus bounding with glides in Leach's Storm-Petrel. Note the size difference, with Leach's being larger.

Leach's Storm-Petrel is generally larger than the European Storm-Petrel.

Both species have dark plumage, but Leach's Storm-Petrel often shows a pale rump patch that is less distinct in European Storm-Petrel.

European Storm-Petrels have a fluttering flight pattern, whereas Leach's Storm-Petrels display a bounding flight with glides.