OCEAN · FIELD GUIDE
The Record Arctic Tern — The Longest Migration of Any Animal on Earth
It is the smallest animal in this whole fleet — a seabird that weighs less than a phone — and it travels farther than any of them. From a rocky island off England to the edge of Antarctica and back, every single year. The Arctic tern sees more daylight than any creature alive, because it never stops chasing summer.
The smallest traveller, the longest journey
Every animal in this fleet is dwarfed by the ocean it crosses. The Arctic tern is dwarfed by the others — a slender seabird barely 100 grams, lighter than a phone — and yet it travels farther than any of them, farther than any animal on Earth.
Pole to pole, chasing summer
On 25 July 2015 a tern carrying a tiny light-sensing logger lifted off the Farne Islands off the Northumberland coast of England, where it had bred. Rather than hug a coast, it flew overland across the UK and Ireland to the Atlantic, then south down the west coast of Africa, reaching the tip of South Africa by late August.
From there it struck out across the open Indian Ocean — an 8,000 km flight lasting 24 days with no proper stop, feeding on the wing — before pausing at a patch of rich water far out in the Southern Ocean. It reached the coast of Antarctica in November and worked along the ice edge until it settled for the southern summer in the Weddell Sea, deep in Antarctic waters, from February into March 2016.
Then it turned north again — back to the tip of Africa in early April, up the west coast, and home to the Farne Islands by early May 2016, completing a round trip of about 96,000 km in roughly ten months.
A lifetime of distance
Because an Arctic tern can live more than thirty years, a bird like this may fly some three million kilometres in its lifetime — the equivalent of nearly four return trips to the Moon. It is the smallest animal in this whole cast and travels the farthest of any: proof that an epic ocean journey is not about size, but about endurance and the pull of the productive seas at both ends of the world.
See it on the map
Switch on the Animal Journeys layer on the Ocean canvas to follow its pole-to-pole year. The chevrons show its direction; the solid line is the full round trip its geolocator recorded. It joins Nicole the great white, Adelita the loggerhead, the record humpback, E7 the godwit, Phyllis the elephant seal and the record leatherback — each one real and drawn from published, citable science.
Source: Redfern, C. P. F., & Bevan, R. M., "Overland movement and migration phenology in relation to breeding of Arctic Terns Sterna paradisaea," Ibis 161:e12723 (2019). Record-bird route and dates via Newcastle University and BBC Springwatch (2016).
Frequently asked questions
How far does the Arctic tern migrate?
One tagged Arctic tern from the Farne Islands was tracked flying an estimated 96,000 km (almost 60,000 miles) in a single year, from its breeding grounds in England to its winter quarters off Antarctica and back. That is by far the longest migration known in the entire animal kingdom (Newcastle University / Redfern & Bevan, Ibis, 2019).
What route does it take?
The record bird left the Farne Islands on 25 July 2015, flew overland across the UK and Ireland to the Atlantic, then down the west coast of Africa to the tip of South Africa by late August. It then crossed the open Indian Ocean — an 8,000 km non-stop flight over 24 days — to a staging area in the Southern Ocean, moved on to the Antarctic coast, and wintered in the Weddell Sea from February into March 2016 before flying back up to Africa and home to the Farnes by early May.
How can such a small bird fly so far?
The Arctic tern weighs barely 100 grams — less than a phone — yet it is built for a life almost entirely on the wing. It feeds on small surface fish, often on the move, and rides global wind patterns in long loops and S-curves to save energy rather than flying in straight lines. Crossing a whole ocean non-stop, feeding as it goes, is routine for it.
Why does it fly all the way to Antarctica?
By breeding in the Arctic summer and then flying to the Antarctic summer, the Arctic tern lives in near-perpetual daylight and feeds in the richest, most productive waters at both ends of the world. It experiences more hours of sunlight per year than any other animal on Earth.
How far does an Arctic tern fly in its whole life?
Arctic terns can live more than thirty years. At roughly 90,000–96,000 km a year, a single bird may fly some three million kilometres in its lifetime — the equivalent of nearly four return trips to the Moon (Newcastle University, 2019).
Is the track on the map exactly the route it flew?
It is an honest schematic of the recorded route, drawn from the bird's dated geolocator data, not a claim of exact daily positions. The line follows the published staging points — the Cape of Good Hope, the Indian Ocean staging area at 35.4°S 71.9°E, the Antarctic coast, and the Weddell Sea at 69.6°S 25.3°W — and back home. Every distance and date shown is a sourced figure (Redfern & Bevan, 2019).
SEE IT LIVE
Everything in this guide is on the live ocean map.