Abstract
An opportunistic boat-based survey to the Mauritania upwelling zone in July 2005 discovered an unprecedented concentration of Wilson’s Storm-petrels Oceanites oceanicus. Flocks of up to 600 birds were concentrated along the boundary between warm surface waters and cooler upwelled waters. These flocks formed an aggregation of at least 5,000 birds, which is an unprecedented total for this species in Western Palearctic waters.
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