A tiny GPS tracker attached to a European honey buzzard revealed an extraordinary feat of endurance that few humans can match. In 42 days, this bird traveled more than 10,000 km from its winter habitat in South Africa to its breeding habitat in Finland, crossing deserts, mountain ranges and several countries along the way. The journey, documented by researchers led by Finnish ornithologist Dr. Patrik Byholm as part of Project Honey Buzzard, offered an unprecedented glimpse of one of the world’s most remarkable migrations. The data not only showed where the bird traveled, but also how it timed its flights, selected energy-efficient routes and adapted to changing landscapes and weather conditions.
How scientists tracked a European honey buzzard’s epic 10,000km journey
Researchers fitted European honey buzzards (Pernis apivorus) with a lightweight GPS satellite transmitter before they began their spring migration from southern Africa. Unlike traditional bird ringing, which relies on occasional retrievals of tagged birds, the transmitter continuously relays precise location data, allowing scientists to monitor bird movements in real time.Tracking revealed that Guldar traveled more than 10,000 km in just 42 days, an average of about 230 km every day. GPS data recorded its altitude, flight speed, stopping places and travel patterns, helping researchers study how the bird reacts to changing weather conditions during its migration. Each new transmission adds another piece to the puzzle of one of Europe’s least understood migratory birds.
Bird’s 10,000 km journey was guided by nature’s invisible highways
The European honey buzzard did not simply take the shortest route between South Africa and Finland. Instead, it followed an energy-efficient route through East Africa, the Nile Valley, the Middle East, and Europe, carefully avoiding long stretches of open water whenever possible. While this increased travel distance, it also dramatically reduced the amount of energy required to remain airborne.The reason for this lies in the bird’s flying technique. Honey buzzards are flying birds of prey that depend on thermals, rising columns of hot air formed when the Sun heats the ground. These invisible air currents allow the bird to move upward before flying long distances without constantly flapping its wings. Thermals are abundant on land but rare on large bodies of water, making sea crossings far more difficult. By linking together these natural “highways” in the sky and taking advantage of favorable winds, the buzzards complete their epic migration with remarkable efficiency.
One of nature’s most efficient long-distance travelers
The European honey buzzard makes this remarkable migration each year, breeding across much of Europe before spending the northern winter in tropical Africa. During its annual journey, it crosses an exceptionally diverse landscape, including African savannas, deserts, Mediterranean coastlines, mountain ranges and dense European forests.Despite traveling thousands of kilometres, this species is able to return to the same breeding areas with surprising precision year after year. Scientists believe that this extraordinary navigational ability depends on several natural cues, including the Earth’s magnetic field, the position of the Sun, visual landmarks, favorable wind systems, and an inherited tendency that is refined through experience.Unlike most birds of prey, the European honey buzzard has a highly specialized diet. It feeds mainly on the larvae of wasps and bees, using its slender head, dense facial feathers and powerful claws to dig underground nests to protect itself from stings.
What researchers learned from GPS data
In addition to documenting an extraordinary journey, the GPS transmitter revealed how migratory birds make complex decisions during their journeys. The researchers identified important stopover sites where the buzzards rested and replenished their energy before moving north. These sites are often as important to survival as breeding and wintering grounds.Tracking also revealed how closely migration is linked to weather. Instead of flying continuously, the bird adjusted its schedule according to wind direction, temperature, and strength of thermals. The strong westerly wind allowed it to cover great distances in a single day, while bad weather often forced it to stop until conditions improved. These findings explain why migratory birds often choose longer routes, which are safer and more energy efficient, rather than following the shortest path.
GPS tracking is changing bird research
Modern GPS and satellite telemetry have revolutionized the study of bird migration by allowing scientists to follow birds across entire continents with unprecedented accuracy. Researchers can now identify important feeding and resting sites, estimate survival rates, understand how migration timing changes from year to year, and monitor how climate change is reshaping traditional migration routes.These insights have become increasingly valuable as habitat destruction, infrastructure expansion, and changing weather patterns threaten migratory birds around the world. By identifying the landscapes that birds rely on most, scientists and conservationists can better protect international migration corridors that span dozens of countries.