Scientists Solve Mystery of Sharp Falcon Eye

A man displays a falcon which was sold for $173,000 during Saudi Falcons Club Auction in King Abdulaziz Festival in Mulham, north of Riyadh, Saudi Arabia, Oct. 13, 2020. (Media Center Saudi Falcons
Club Auction via Reuters)
A man displays a falcon which was sold for $173,000 during Saudi Falcons Club Auction in King Abdulaziz Festival in Mulham, north of Riyadh, Saudi Arabia, Oct. 13, 2020. (Media Center Saudi Falcons Club Auction via Reuters)
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Scientists Solve Mystery of Sharp Falcon Eye

A man displays a falcon which was sold for $173,000 during Saudi Falcons Club Auction in King Abdulaziz Festival in Mulham, north of Riyadh, Saudi Arabia, Oct. 13, 2020. (Media Center Saudi Falcons
Club Auction via Reuters)
A man displays a falcon which was sold for $173,000 during Saudi Falcons Club Auction in King Abdulaziz Festival in Mulham, north of Riyadh, Saudi Arabia, Oct. 13, 2020. (Media Center Saudi Falcons Club Auction via Reuters)

The eye of falcon has always been an example on the sharpness of sight, for its role in helping the bird target its prey. This power confused scientists who speculated that the dark 'eyeliner' feathers of peregrine falcons act as sun shields to improve the birds' hunting ability. This hypothesis has been lately proved in a new scientific study led by researchers from the University of Cape Town (UCT) and the University of Witwatersrand, South Africa.

The distinctive dark stripes directly beneath the peregrine falcon's eyes, called the malar stripe, likely reduce sunlight glare and confer a competitive advantage during high-speed chases. It's an evolutionary trait mimicked by some top athletes who smear dark makeup below their eyes to help them spot fast-moving balls in competitive sports.

In the new study, published in the journal Biology Letters, the scientists determined the role of this eyeliner in improving the sharpness of the falcon's eye. They found these markings have evolved according to the climate; the sunnier the bird's habitat, the larger and darker are the dark 'sun-shade' feathers.

The scientists used photos of peregrine falcons from around the world posted on the web by bird watchers and scored the size of the malar stripe for each bird. They then explored how these malar stripes varied in relation to aspects of the local climate, such as temperature, rainfall, and strength of sunlight. They examined samples from 94 different regions or countries. Results showed that peregrine falcon malar stripes were larger and darker in regions of the world where sunlight is stronger.

"The solar glare hypothesis has become ingrained in popular literature, but has never been tested empirically before. Our results suggest that the function of the malar stripe in peregrines is best explained by this solar glare hypothesis," said senior author Michelle Vrettos in a report posted on the UCT website.

Co-author Arjun Amar said: "The peregrine falcon represents the ideal species to explore this long-standing hypothesis, because it has one of the most widespread distributions of all bird species, being present on every continent except Antarctica. We are grateful to all the photographers around the world that have deposited their photos onto websites. Without their efforts this research would not have been possible."



This Swedish Church is Moving 3 Miles Down the Road. It's Relocating before a Mine Swallows the Town

Kiruna's old wooden church is moved during a two-day relocation trip to a new site next to a cemetery, to save its wooden walls from ground subsidence and the expansion of the world's largest underground iron ore mine, in Kiruna, Sweden August 19, 2025. REUTERS/Leonhard Foeger
Kiruna's old wooden church is moved during a two-day relocation trip to a new site next to a cemetery, to save its wooden walls from ground subsidence and the expansion of the world's largest underground iron ore mine, in Kiruna, Sweden August 19, 2025. REUTERS/Leonhard Foeger
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This Swedish Church is Moving 3 Miles Down the Road. It's Relocating before a Mine Swallows the Town

Kiruna's old wooden church is moved during a two-day relocation trip to a new site next to a cemetery, to save its wooden walls from ground subsidence and the expansion of the world's largest underground iron ore mine, in Kiruna, Sweden August 19, 2025. REUTERS/Leonhard Foeger
Kiruna's old wooden church is moved during a two-day relocation trip to a new site next to a cemetery, to save its wooden walls from ground subsidence and the expansion of the world's largest underground iron ore mine, in Kiruna, Sweden August 19, 2025. REUTERS/Leonhard Foeger

How do you move one of Sweden’s most beloved wooden churches down the road? With a little bit of engineering, a lot of prayer — and some Eurovision for good luck.

The Kiruna Church — called Kiruna Kyrka in Swedish — and its belfry are being moved this week along a 5-kilometer (3-mile) route east to a new city center as part of the town’s relocation. It’s happening because the world’s largest underground iron-ore mine is threatening to swallow the town.

This week, thousands of visitors have descended upon Kiruna, Sweden's northernmost town at 200 kilometers (124 miles) above the Arctic Circle. It's home to roughly 23,000 inhabitants, including members of the Sami Indigenous people, spread over nearly 19,500 square kilometers (7,528 square feet).

Lena Tjärnberg, the church’s vicar, kicked off the move with a blessing Tuesday morning. The journey is scheduled to end Wednesday afternoon.

The church was a gift from the mining company

In 2001, the Swedish people voted the wooden church the “best building of all time, built before 1950” in a poll connected to the Ministry of Culture. Built on a hill so worshippers could overlook the rest of Kiruna, the Swedish Lutheran church was designed to emulate the Sami style as a gift from LKAB, the state-owned mining company.

The Kiruna mine itself dates back to 1910 and the church was completed in 1912. Its neo-Gothic exterior is considered the town's most distinctive building and tourists regularly traveled there before it was closed a year ago to prepare for the relocation. It's set to reopen in the new location at the end of 2026.

Tjärnberg said the final service in the old spot was bittersweet.

"The last day you go down the stairs and close the church door, you know it's going to be several years before you can open it — and in a new place,” she said. “We don't know how it's going to feel to open the door.”

The spectacle

This week's move has turned into a two-day highly choreographed media spectacle, run by LKAB and featuring an appearance by Swedish King Carl XVI Gustaf. Musical performances will include a set from KAJ, Sweden’s 2025 Eurovision entry that was the bookies’ favorite to win this year’s contest but lost out to classically trained countertenor JJ of Austria.

SVT, Sweden's national broadcaster, is capitalizing on the showcase and is livestreaming the move both days, billing it as “The Great Church Walk” to play off its success with the spring showing of “The Great Moose Migration” that has enthralled millions of viewers annually since 2019.

Known for both the Midnight Sun and the Northern Lights, Kiruna and the surrounding area is a major draw year-round for visitors to Swedish Lapland. The region also features the Aurora Sky Station, the Icehotel and Kebnekaise, the Nordic country’s highest mountain.

British tourists Anita and Don Haymes had already trekked to Kiruna twice before this year's trip. When they heard about the church's move, they changed their itinerary to ensure they'd be here for it. They took photographs of it propped up on beams and wheels this week before the move.

“It's an amazing feat that they are doing,” Anita Haymes said Sunday. “It'll be interesting to see it moving, unbelievable.”

But not everyone is thrilled about LKAB's extravaganza. Lars-Marcus Kuhmunen, chairman of one of the Sami reindeer herding organizations in Kiruna, said LKAB's plans for a new mine could threaten reindeer migration routes and imperil the livelihood of herders in the area.

The mechanics behind the move

The move of Kiruna's town center, including the church, has been in the works since 2004. As the mine expanded deeper underground, residents began seeing cracks in buildings and roads. In order to reach a new depth of 1,365 meters (4,478 feet) — and to prevent Kiruna from being swallowed up — officials began moving buildings to a new downtown at a safe distance from the mine.

As of July, 25 buildings had been lifted up onto beams and wheeled east. Sixteen, including the church, remain.

At approximately 40 meters (131 feet) wide with a weight of 672 metric tons (741 tons), the church required extra effort. Engineers widened a major road from 9 meters to 24 meters (30 to 79 feet) and dismantled a viaduct to make way for a new intersection.

A driver, using a large control box, is piloting the church through the route as it travels roughly 12 hours over Tuesday and Wednesday — with a pause each day for fika, the traditional Swedish afternoon coffee break. It's expected to move at a varying pace between 0.5 and 1.5 kilometers per hour (0.31 and 0.93 miles per hour).

Stefan Holmblad Johansson, LKAB's project manager for the move, would not say how much it has cost the mining company.