Miscellaneous Birds Codexery

Gannet

Large seabirds that dive from great heights to catch fish.

Gannet

Gannets are seabirds in the genus *Morus*, part of the family Sulidae, which also includes boobies. In Scotland, they are called "solan" or "solan goose," though a common mistake is to use "guga"—that Gaelic term actually refers only to the chicks. These large white birds have yellowish heads, long bills, and black-tipped wings. The northern gannet, with a wingspan reaching two metres, is the biggest seabird in the North Atlantic. The other two species live in the temperate waters off southern Africa, southern Australia, and New Zealand.

The word "gannet" comes from Old English *ganot*, meaning "gander." In Spanish, the species name *Alcatraz* gave its name to the famous Alcatraz Federal Penitentiary. The genus name *Morus* is from Ancient Greek for "stupid" or "foolish," because breeding gannets and boobies show no fear of humans and were easily killed.

Gannets hunt by diving into the sea from heights of up to 30 metres and chasing fish underwater. They have several adaptations: no external nostrils (these are inside the mouth), air sacs under the skin on the face and chest that cushion the impact like bubble wrap, and forward-set eyes for binocular vision to judge distance. They can hit the water at 100 km/h, allowing them to catch fish deeper than most airborne birds. Their reputation for eating huge amounts of fish has made "gannet" a term for someone with a voracious appetite.

These birds breed in colonies on islands and coasts, usually laying a single chalky-blue egg. Instead of brood patches, they use their webbed feet to warm the eggs. They reach maturity at about five years old. First-year birds are entirely black, with more white appearing in later subadult plumages.

The UK hosts about two-thirds of the world’s northern gannets, mainly in Scotland, including the Shetland Isles. Other populations nest in Canada, Ireland, the Faroe Islands, and Iceland, with smaller numbers in France (Bay of Biscay), the Channel Islands, Norway, and a single colony in Germany on Heligoland. The largest colony, on Scotland’s Bass Rock in the Firth of Forth, held about 75,000 pairs in 2014. Other important sites include Sulasgeir off Lewis, St Kilda, Grassholm in Pembrokeshire, Bempton Cliffs in Yorkshire, Sceilig Bheag in Ireland, Cape St Mary’s in Newfoundland, and Bonaventure Island in Quebec.

The three gannet species are usually placed in the genus *Morus*, with Abbott’s booby in *Papasula* and the other boobies in *Sula*. Some authorities, however, argue all nine sulid species should be in *Sula*. At one time, all gannets were considered a single species. Most fossil gannets date from the Late Miocene or Pliocene, when seabird diversity was much higher. The cause of the decline at the end of the Pleistocene is unclear, but increased competition from marine mammals may have played a role. The fossil record for *Morus* is much richer than for *Sula*, even though boobies are more numerous today. The reasons are unknown; boobies may have been better adapted or simply lucky to be in the right places during Late Pliocene changes, or many booby fossils may still be undiscovered. Today, gannets are limited to temperate oceans, while boobies also live in tropical waters, but several prehistoric gannet species had a more equatorial range than modern ones. Fossil gannet species include *Morus loxostylus*, *M. olsoni*, *M. lompocanus*, *M. magnus*, *M. peruvianus*, *M. vagabundus*, *M. willetti*, *M. peninsularis*, *M. recentior*, and *M. reyanus*.

In many parts of the UK, "gannet" describes someone who steadily eats vast quantities of food, especially at public functions. Young gannets were historically used as food, a tradition still practiced in Ness, Scotland, where the chicks are called "guga." This practice, like traditional whale harvesting, sparks controversy over whether it should keep its exemption from standard seabird protections in UK and EU law. The Ness hunt is limited to 2,000 chicks per year and dates back at least to the Iron Age. It is considered sustainable, as gannet numbers in Scotland rose from 30,000 to 180,000 between 1902 and 2003. In *The Bookshop Sketch* from *At Last the 1948 Show* (1967), a customer asks for the expurgated version of *Olsen’s Standard Book of British Birds*—the one without the gannet—because he dislikes the bird.

Scientific name
Morus
Family
Sulidae
Wingspan
Up to 2 metres (6+1⁄2 feet)
Diet
Fish
Etymology
From Old English 'ganot', meaning 'gander'

Lore & Background

Their supposed capacity for eating large quantities of fish has led to 'gannet' becoming a description of someone with a voracious appetite. Gannets are colonial breeders on islands and coasts, normally laying one chalky-blue egg. They lack brood patches and use their webbed feet to warm the eggs. They reach maturity around 5 years of age. First-year birds are completely black, and subsequent subadult plumages show increasing amounts of white. The most important nesting ground for northern gannets is the United Kingdom, with about two-thirds of the world's population, mainly in Scotland including the Shetland Isles. Other important breeding sites include Sulasgeir, St Kilda, Grassholm, Bempton Cliffs, Sceilig Bheag, Cape St Mary's, and Bonaventure Island.

Reader's Guide

Gannets are significant as the largest seabirds in the North Atlantic and as colonial breeders whose populations are concentrated in the United Kingdom. The term 'gannet' has entered common usage in the United Kingdom to describe someone with a voracious appetite. Historically, young gannets were used as a food source, a tradition still practised in Ness, Scotland, where they are called 'guga'. The hunt remains controversial, with debates over exemptions from ordinary seabird protections. The genus Morus is better documented in the fossil record than the related booby genus Sula, though boobies are more numerous today. Most fossil gannets are from the Late Miocene or Pliocene. Notably, gannets are today restricted to temperate oceans, while several prehistoric gannet species had a more equatorial distribution.

Did You Know?

A Granite Slab in the North Atlantic

Funk Island presents as a small, nearly flat trapezoid of feldspathic granite rising just fourteen metres above the North Atlantic, stretching no more than eight hundred metres in length and three hundred in width. Two roughly parallel fault lines cut across the island in a northwesterly direction, splitting it into three distinct zones. The northeastern quarter is largely bare rock, the central strip carries only scattered vegetation, while the southwestern half—more than half the total land area—is blanketed in grasses, lichens, and mosses. Reaching the island is no small feat. In rough seas the cliffs are impassable, and even in calm conditions only three spots permit a safe landing: Gannet Head at the southwestern tip, Landing Rock just to its north, and a narrow natural shelf called The Bench set into a cliff on the northern face, roughly a metre and a half wide and sloping upward. Off the southwest side, two large rock bunkers are regularly submerged, serving as roosting platforms rather than nesting sites for gannets and other seabirds. Despite the documented history of shipwrecks and lost lives in these waters, the island carries no lighthouse or navigational aid whatsoever.

From Penguin Island to Funk

The name Funk Island is, by one account, a blunt reference to the overwhelming stench that hangs over the rock. Centuries of seabird guano have built up concentrated deposits of nitrate and phosphate, producing what sailors described as an evil odour or vapour. A less unpleasant theory traces the name to a Norse or Icelandic word meaning haycock, a shape the island loosely resembles. Long before "Funk" took hold, the island went by names that celebrated its avian abundance. English and French sources from the sixteenth and seventeenth centuries consistently called it Penguin Island or Island of the Birds—a reference to the great auk, which nested there in numbers reaching tens of thousands. The American Heritage Dictionary even suggests the word "penguin" itself may derive from the Breton phrase penn gwenn, meaning "white head," possibly coined by Breton settlers in the nearby region known as Terra de Bretones.

The Extinction of the Great Auk

The great auk, known in Norse as geirfugl or garefowl, was the island's most vulnerable resident. Flightless and dense in number, it offered an almost effortless harvest to arriving Europeans. In the early sixteenth century, transatlantic fishermen desperate for fresh provisions at the end of long voyages found the auks could be swept up gang planks and into boats with minimal effort. Settlers along the northeast coast made regular trips to kill birds for meat, render oil for lamps, stuff feathers into pillows and mattresses, and collect eggs.

A Living Seabird Engine

Today Funk Island functions as a protected wildlife sanctuary with strictly restricted access. The cold Labrador Current flowing past its shores creates nutrient-rich conditions that sustain dense populations of cold-water fish. Those fish, in turn, anchor one of the most concentrated seabird breeding colonies in the North Atlantic. Among the many species that return each season, the common murre is the most abundant, though gannets and numerous other seabirds also depend on the island and its two offshore rock bunkers. The bunkers, regularly submerged by the sea, serve as roosting platforms rather than nesting sites, giving gannets a resting place between foraging trips. At high tide, waves crash broadly against the cliffs, and in particularly heavy seas they break entirely over the island's low profile. Centuries of bird activity are visible in the thick guano deposits that once gave the island its pungent name. Millions of birds nested here over the ages, and the nitrogen and phosphorus they left behind still shape the thin vegetation clinging to the southwestern grasslands. The island's isolation—some sixty-five kilometres northeast of Musgrave Harbour, Newfoundland—has kept it largely untouched by human development, preserving a dynamic that has operated for millennia.

Frequently Asked Questions

What is a Gannet?

A gannet is a large seabird in the genus Morus, part of the Sulidae family, making it a close cousin of the booby. It holds the title of largest seabird in the North Atlantic, with a wingspan that can stretch to two metres.

Why is the Gannet important to its ecosystem?

As top-level marine predators, gannets help regulate fish stocks in the oceans they inhabit. Their enormous breeding colonies also make them a useful barometer for the overall health of marine environments.

What's Gannet's diet?

Gannets are dedicated fish-eaters, relying entirely on the plunge-dive technique to capture their prey. They don't scavenge or browse on invertebrates; their foraging is built around hunting fish from the air.

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