Cape Gannet

Fascinating facts about the Cape Gannet

• Cape gannets launch from great heights and enter the water at speeds that vary with altitude, ranging from 40 to 86 km/h. This rapid impact allows them to break the surface tension and pursue fish that swim just below. Their powerful plunge-dive is a key hunting technique, enabling them to capture prey that other birds cannot reach. The speed and height together give them a distinct advantage in the marine environment.
• The Cape gannet's bill is a pale-blue, pointed structure with fine serrations near the tip, and it completely lacks external nostrils. This absence prevents water from being forced into the nasal passages during the high-speed dives they perform to catch fish. By keeping the nostrils sealed, the bird can maintain clear breathing pathways even when striking the water at up to 86 km/h. The specialised bill thus supports their extreme plunge-diving lifestyle.
• Between 1956 and 2000 the breeding population on Namibian islands plummeted from 114,600 to 18,200 pairs, an 84 % decline in less than fifty years. In stark contrast, South African islands saw their numbers rise about 4.3-fold, increasing from 34,400 to 148,000 breeding pairs over the same period. This opposite trend highlights regional differences in colony health and suggests varying pressures or conservation outcomes across the species' range.
• The Cape gannet's biggest breeding site is on Malgas Island in South Africa, where more than 140 000 birds gather each season. This colony forms part of a population that totals about 340 000 individuals, most of which (88 %) live in South Africa. The species breeds only on a few islands off southern Africa, usually nesting in dense groups on flat islands or flat ledges. Such large, concentrated colonies are typical of its restricted breeding range.
• A Cape gannet chick emerges from the egg weighing just 70 g, naked, blind and black. Within three weeks it has reached roughly one third of adult mass, and by eight weeks it already outweighs its parents. The youngster remains heavier than the adult until it fledges after 95-105 days, when it finally leaves the nest as a fully fledged bird. Rapid early growth is essential for its survival at sea.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Cape Gannet

As the Cape Gannet takes to the skies, its sleek, snow-white body slices through the turbulent air with effortless precision, its piercing gaze scanning the waves below for the telltale flash of a schooling fish. With a swift, decisive plunge, it spears into the ocean's depths, its wings tucked tight, a fleeting, feathered arrow vanishing into the blue. In this fleeting moment, we glimpse the remarkable agility and predatory prowess of a species now precariously balanced on the brink of extinction.

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