Found this morning on the pebbles in Hove - one bedraggled, dead northern gannet. Where did it come from, and how did it meet its final fate? One photographer has described these birds diving as ‘white arrows dropping from the sky’. Unfortunately, not this one any longer,`
Northern gannets (Morus bassanus) are large, striking seabirds - with white body and black wingtips - which live in huge colonies on rocky cliffs and islands. Typically, they remain most of the year between late February and early October when they set out on a long journey to winter on the west coast of Africa.
The northern gannets breed in their colonies between April and June, building nests from seaweed and other debris. The female lays a single egg, and both parents take turns incubating the egg for about 44 days. Once hatched, the chick is fed regurgitated fish by its parents; it fledges at around 10-12 weeks old. However, young gannets do not reach sexual maturity until reaching 4 or 5 when they join the breeding colonies and begin the cycle again. Average lifespan is 17 years, and their wingspan can reach 1.8 metres. They feed by circling high above the waves, before folding their wings back and make spectacular dives into the water headfirst to catch fish. They have special adaptations, such as air sacs in their chest and strong skulls, to withstand high impacts.
The most significant colonies of northern gannets are located in Scotland. Bass Rock is the world’s largest: it had over 75,000 pairs (i.e. 150,000 individuals) as of about ten years ago. However, it was badly hit by Avian Flu, and the population was thought to have dropped 30% in 2023. Other larges colonies (over 10,000) also exist at St Kilda and Sula Sgeir (Outer Hebrides), and Ailsa Craig (Firth of Clyde). Elsewhere in the British Isles colonies are sited at Bempton Cliffs on the Yorkshire coast, Grassholm in Wales, and Little Skellig in Ireland (the latter with over 30,000 breeding pairs).
Northern gannets are currently classified as ‘Least Concern’ by the International Union for Conservation of Nature, though they do face threats from climate change, pollution, and entanglement in fishing gear. Possible causes for the death of the gannet in these photos are: natural causes, i.e. old age, disease, or injury; exhaustion after severe winter storms; food shortages; pollution, which can weaken birds and make them more susceptible to disease; Avian Flu. More information can be found at Wikipedia and the Scottish Seabird Centre.Richard Creagh’s website includes some spectacular photographs of northern gannets, as well as his own testimony of observing them (from 2017): ‘Gannets are the largest Irish seabird, with a wingspan just short of two metres. They are beautiful birds to watch, and what really sets them apart for me is their stunning dives. Ever since I first noticed them that afternoon in West Cork I’ve been drawn to those white arrows dropping from the sky in pursuit of fish. Diving from as high as forty metres gannets hit can hit the water at 60mph.’
Interestingly, there’s a comment on the same website from Stephen O’Melia who recalls watching northern gannets while swimming just along the coast from Brighton at Worthing: ‘It was around 3.00pm, about 90 minutes after high tide when a gannet approached a couple of women floating in the sea. It made an attempt to attack them but was eventually driven off by a third swimmer. But it circled round and attacked again. It later approached two other swimmers before flying off. This took place about 30 to 50 feet from the shore. I have never seen a gannet in Worthing before, and none of the other swimmers had either. No one was hurt but it was the persistency in the bird's approach which was surprising. We wondered whether it was unwell.’