Arctic Tern: Iceland's Dive-Bombing Summer Visitor

Between May and September, Iceland transforms into one of the world's most important breeding grounds for the Arctic tern (*Sterna paradisaea*), a remarkable seabird that undertakes the longest migration of any animal on Earth. These elegant yet fiercely protective birds arrive in their tens of thousands, turning coastal areas and offshore islands into bustling colonies where the air fills with their distinctive calls and, for the unwary visitor, their aggressive defensive dives.

The Ultimate Migrants

Arctic terns hold the record for the longest annual migration in the animal kingdom, travelling roughly 71,000 kilometres each year from Arctic to Antarctic and back again. These extraordinary birds experience two summers annually, following the midnight sun from one pole to the other. When they depart Iceland's shores in late August and September, they begin an epic journey that will take them along the coasts of Europe and Africa, across the Southern Ocean, and finally to the pack ice of Antarctica.

The terns that breed in Iceland are part of a circumpolar population that nests across the Arctic regions of North America, Europe, and Asia. Iceland's position in the North Atlantic makes it a crucial breeding site, hosting an estimated 250,000 to 300,000 breeding pairs—roughly one-third of the global population.

Prime Locations for Tern Watching

Westman Islands (Vestmannaeyjar)

The Westman Islands, 13 kilometres off Iceland's south coast, host the country's largest Arctic tern colonies. Heimaey, the largest and only inhabited island, provides excellent viewing opportunities from May through August. The ferry journey from Landeyjahöfn takes 35 minutes and costs 1,540 ISK (€10.50/£9) for adults. The islands' dramatic cliffs and grassy slopes create ideal nesting habitat, with some colonies containing thousands of pairs in close proximity.

Dyrhólaey

This dramatic natural arch near Vík offers spectacular tern watching opportunities without requiring a boat journey. The 120-metre-high promontory provides elevated views over extensive tern colonies on the black sand beaches below. Access is free, though the area may be closed during peak nesting season (15 May to 25 June) to protect breeding birds.

Lake Mývatn Region

Unusually for seabirds, Arctic terns also nest around Iceland's inland lakes. The Mývatn area in northeast Iceland hosts several thousand pairs, where visitors can observe the remarkable sight of marine birds nesting in a freshwater environment surrounded by volcanic landscapes. The pseudo-craters around Skútustaðir provide excellent vantage points for photography.

Reykjanes Peninsula

The southwestern peninsula offers easily accessible tern colonies, particularly around Reykjanesviti lighthouse and the coastal areas near Grindavík. These locations provide excellent opportunities for photographers, with dramatic volcanic backdrops complementing the white and grey birds.

Behaviour and Nesting

Arctic terns arrive in Iceland from early May onwards, with peak numbers reached by June. They nest in colonies ranging from a few dozen pairs to several thousand, showing a preference for islands, coastal areas, and lakeshores. The birds create simple scrapes in sand, gravel, or short grass, often lined with shells, pebbles, or vegetation.

Each pair typically lays 1-3 eggs, most commonly two, which both parents incubate for 21-22 days. The timing is crucial—chicks must fledge before the brief Arctic summer ends and food sources diminish. Young terns take their first flight approximately 21-24 days after hatching but continue to depend on their parents for several weeks.

The Dive-Bombing Defence

Arctic terns are legendary for their aggressive defence of nesting areas. When humans approach within 50-100 metres of a colony, the birds launch coordinated aerial attacks, diving at intruders with remarkable precision. They aim for the highest point—usually the head—and their sharp bills can inflict painful wounds. This behaviour has earned them the nickname "sea swallows with attitude" among Icelandic bird guides.

The attacks intensify when eggs are present (June-July) and continue until young birds fledge in late July or August. Experienced tern colonies can mount sustained attacks involving hundreds of birds, creating a deafening cacophony of calls while maintaining relentless aerial pressure on perceived threats.

Photographing Arctic Terns

For photographers, Arctic terns present both exceptional opportunities and significant challenges. Their graceful flight, distinctive forked tails, and dramatic behaviour create compelling subjects, but their aggressive nature requires careful planning and appropriate equipment.

A telephoto lens of at least 300mm is essential for maintaining safe distance whilst capturing detailed images. The best photography opportunities occur early morning (5:00-8:00) and late evening (19:00-22:00) when lighting is optimal and birds are most active. During Iceland's bright summer months, these times offer warm, directional light that enhances the birds' white plumage and coral-red bills.

Conservation and Challenges

Iceland's Arctic tern population faces mounting pressures from climate change, which affects their marine food sources and alters ocean currents along their migration routes. Warming seas push fish stocks northward, forcing terns to fly greater distances to feed their young. Additionally, increased human activity in coastal areas creates disturbance during the critical breeding season.

The birds' tendency to abandon nests when repeatedly disturbed makes responsible wildlife viewing essential. Visitors should maintain distances of at least 100 metres from colonies, avoid sudden movements, and never approach nests directly. Many sites now provide designated viewing areas that offer excellent observations while minimising disturbance.

Planning Your Visit

The optimal time for Arctic tern watching in Iceland runs from mid-May through August, with peak activity in June and July. Weather conditions significantly impact viewing success—calm, clear days provide the best opportunities for observing natural behaviour, while windy conditions can make the birds more aggressive and difficult to photograph.

Essential equipment includes protective headwear (terns target the highest point), sunglasses, and sturdy footwear for navigating coastal terrain. Many tour operators now offer specialised bird-watching excursions that include expert guidance on tern behaviour and photography techniques, typically costing 8,500-12,000 ISK (€58-82/£52-73) for half-day trips.

For those seeking the ultimate Arctic tern experience, visiting multiple locations provides insight into their adaptability—from the marine environment of the Westman Islands to the freshwater lakes of Mývatn. Each location offers unique perspectives on these remarkable birds that spend their lives chasing summer across the globe, making Iceland their temporary but crucial home for just a few precious months each year.

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