The smallest seabirds in the world are masters of walking on the ocean surface.

Nature · Published 3 October 2026 Swipe more like this →

In short: Austral storm petrels are the smallest of all seabirds, yet they possess a remarkable ability to hover and patter their feet across the water to snatch prey. These elusive, nocturnal creatures spend their lives at sea, returning to land only to breed in dense, hidden colonies on isolated islands.

The family Oceanitidae, or austral storm petrels, represents a distinct evolutionary lineage within the order Procellariiformes. Genetic analysis, specifically of cytochrome b DNA sequences, indicates that these birds are basal to the order, diverging before the northern storm petrels. Despite their cosmopolitan distribution, they are notoriously difficult to study. Their pelagic lifestyle and tendency to nest in burrows or crevices on remote, mammal-free islands make them hard to track. Researchers often struggle with identification, as experts like Onley and Scofield have noted that much of the published literature and photographic evidence is frequently misidentified.

These birds have evolved specialized flight techniques to survive in the open ocean. While they are capable of dynamic soaring, they favor slope soaring and a unique behavior known as surface pattering. By holding their feet on the water's surface while fluttering, they remain stationary to feed on planktonic crustaceans, small fish, and mollusks. This feeding strategy is highly efficient, allowing them to maximize energy intake for their chicks. Parents produce energy-rich stomach oil in their proventriculus, which accounts for a significant portion of the meals they regurgitate for their young during nocturnal visits to the nest.

Life for an austral storm petrel is a slow, high-investment process typical of K-selected species. They form long-term monogamous bonds and lay only a single egg per season. Incubation and fledging are protracted, often taking over 100 days combined. Despite their small size, they are long-lived, with some individuals recorded reaching 30 years of age. However, they face severe threats from human activity, particularly the introduction of invasive mammals like rats and feral cats to their breeding grounds. The New Zealand storm petrel, for instance, was presumed extinct until its rediscovery in 2003, highlighting the fragility of these isolated populations.

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