Northern Gannet

Several adaptations work together. As it drops, the gannet folds its long wings back until it forms a rigid, tapered spear, so it enters the water cleanly rather than belly-first. Under the skin of its face, throat, and chest is a network of small air sacs, connected to the lungs, that inflate and act as bubble wrap, spreading the impact force. The gannet has no external nostrils — the openings are inside the bill and can be closed — so water is not driven into its airways. Its skull and neck are strongly built to take the compression, and it hits the surface with the body straight and streamlined. Even so, the deceleration is violent, and old or repeatedly injured gannets do sometimes suffer neck trauma.

The plunge-dive itself carries the bird only a few metres down — typically 3 to 10 metres — using the momentum from the fall. But gannets do not stop there — once submerged they often swim actively downward with their wings and feet in pursuit of the fish, reaching depths of 15 to 25 metres and occasionally more. This two-stage hunting — a fast aerial entry to get past the surface, then underwater swimming — lets them exploit shoals that are too deep for surface-feeding seabirds like gulls and terns.

The word gannet comes from an Old English term related to "gander," reflecting the bird's goose-like size and shape in flight. "Solan goose" is an old Scottish name (from Old Norse) for the same bird, used especially on the Firth of Forth, where young gannets — "gugas" — were harvested from the Bass Rock for food and oil for centuries. The scientific name Morus bassanus refers directly to the Bass Rock, the island in the Forth that has one of the world's largest northern gannet colonies. A licensed traditional guga hunt still takes place each year on the Isle of Lewis. The word "gannet" is also British slang for a greedy eater.

The species is listed as Least Concern and its overall numbers grew strongly through the 20th century after historical persecution eased, with well over half a million pairs across the North Atlantic. However, the outlook has worsened. Highly pathogenic avian influenza (H5N1) reached gannet colonies in 2021 and 2022 and caused heavy mortality at major sites, including Bass Rock and colonies in Canada, with some counts dropping by a quarter or more in a single season. Gannets are also affected by depletion of forage fish, entanglement in fishing gear, plastic ingestion and nest incorporation, and disturbance at their few, concentrated breeding sites, which makes the population vulnerable despite its size.