In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
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 Enlarge this image toggle caption Stefan Berndtsson Stefan Berndtsson 
  
 Scientists have long suspected that the common swift remains airborne for extraordinary amounts of time during its annual migration. 
  
 Now, a team of scientists in Sweden has proved that these birds fly for tremendously long periods of time. They affixed data loggers onto a total of 19 of the master fliers in 2013 and 2014, and recaptured the birds months or years later. Researchers found that the birds can spend almost their entire 10-month nonbreeding period on the wing. 
  
 The data loggers gathered information on acceleration and flight activity, and those installed in 2014 also included light trackers for geolocation. 
  
 The results were astonishing. For example, according to research published in Current Biology, one of the birds stopped for just four nights in February in 2014 — and the next year it stopped for only two hours. Other birds stopped for longer periods of time. But "even when swifts settle to roost," the researchers say, "the amount of time not flying is very small." 
  
 The birds are known to travel from Europe to sub-Saharan Africa — but they apparently don't touch down there, as National Geographic reports. Researchers say they have never found roosting sites in sub-Saharan Africa. 
  
 The scientists say that the rarity of the stops during nonbreeding season suggests that the bird may only take a pause because of bad weather. The fact that some birds fly continuously during nonbreeding periods indicates that the species may not actually need to land for sleep. In fact, it's unclear "when and to what extent swifts need to sleep," the paper states. 
  
 "They feed in the air, they mate in the air, they get nest material in the air," researcher Susanne Åkesson from Lund University in Sweden tells National Geographic. "They can land on nest boxes, branches, or houses, but they can't really land on the ground." 
  
 The birds' shape contributes to this finding; their "wings are too long and their legs are too short to take off from a flat surface," the magazine reports. 
  
 The researchers suggest that one driving force behind the bird's incredibly long flights could be its diet. "[S]pecializing in high-altitude aerial insects as a main food source requires the suite of adaptations for efficient flight shown by swifts, ... which compromises terrestrial locomotion and make swifts vulnerable to predators and parasites had they been landing more often," the paper states. 
  
 This may remind some eagle-eyed readers of another species with extraordinary flight habits: the frigatebird. As NPR's Christopher Joyce recently reported, those aquatic birds can "stay aloft for weeks at a time," and fly to heights thousands of meters above the sea. And in a recent study, "one of the tagged birds soared 40 miles without a wing-flap." ||||| Every July, young common swifts leave their European roosts and migrate to western and central Africa. They’ll only be back in the following June, and they’ll spend the intervening 10 months almost continuously in the air. They might travel to Africa, but their feet never meet African soil. 
  
 “They feed in the air, they mate in the air, they get nest material in the air,” says Susanne Åkesson from Lund University in Sweden. “They can land on nest boxes, branches, or houses, but they can’t really land on the ground.” That's because their wings are too long and their legs are too short to take off from a flat surface. 
  
 View Images Common swifts soar in Merseyside, England. Photograph by Alan Williams, Nature Picture Library 
  
 As a result, common swifts are among nature’s greatest aeronauts, superbly adapted for a life spent largely in the skies. 
  
 People have long suspected that swifts stay airborne for long stretches of time, but no one could confirm it. Åkesson and her husband, Anders Hedenström, both from Lund University, did so by fitting 19 of the birds with lightweight data loggers in 2013, and recapturing them one or two years later. The loggers had regularly recorded local light levels, which the duo could use to pinpoint the birds’ global position. And they had recorded the swifts’ acceleration, activity, and body positions, which revealed if they were flying or resting. 
  
 The data revealed that some swifts were almost never inactive during their long migrations. For example, between September 2013 and April 2014, one of the birds rested for just four nights in February. The following year, it never rested for a full night; over the same period, it stopped for just two hours. 
  
 View Images A common swift (Apus apus) at the Budapest Zoo Photograph by Joel Sartore, National Geographic Photo Ark 
  
 A few other swifts did rest more often. Åkesson and Hedenström suspect that this was because they hadn’t finished replacing their wing and tail feathers during their annual molt. The old feathers might have compromised their ability to stay permanently aloft, or their inability to molt fully might reflect some underlying health problem that affected their flight. Either way, it’s not like they were actually grounded. If they rested, it was just for a few hours. At most, they spent just 0.64 percent of their migration on terra firma. 
  
 Other scientists have found similar results. In 2013, Felix Liechti from the Swiss Ornithological Institute used similar data loggers to show that three alpine swifts probably flew nonstop for 200 days, on their long migration from Switzerland to Africa and back again. That was especially surprising because alpine swifts are twice the size of common swifts, with wingspans of up to 22 inches. 
  
 Such long nonstop flights imply that swifts must be able to sleep while flying. This August, Niels Rattenborg of the Max Planck Institute for Ornithology in Germany proved that frigate birds—large seabirds with piratical tendencies—do the same. He fitted brainwave sensors to 15 frigatebirds and showed that they sleep mid-flight, for about 40 minutes a day and just a few seconds at a time. 
  
 There’s no brain sensor small enough to record their mental activity of a flying swift, but they surely must be taking midair naps too. Maybe they do what dolphins do, sending one half of their brains to sleep at a time so they can stay continuously alert. |||||
A: 
The common swift makes its cousin's six months in continuous flight look like nothing more than a hop, skip, and a jump. The tiny bird easily steals the record for longest continuous flight by spending 10 months in the air without landing once, reports NPR, by way of a study in Current Biology. In 2013, researchers at Sweden's Lund University strapped adult swifts with accelerometers that recorded when the birds flapped their wings and discovered that they spent all but two months of the year aloft, even as they migrated across the equator and back. Some touched down briefly, probably during bad weather, but, overall, more than 99% of the 10-month nonbreeding period was spent in the sky. That means the fittingly-named birds—their species name, Apus, translates to "footless," reports Discover—ate moths and other insects to sustain themselves while in the air. It's clear they saved energy gliding on rising air, but researchers say it's possible they slept, too. Except to lay their eggs and raise their young, which swifts do for the other two months of the year, "there is no need for them to [land] unless … they encounter very bad weather," study author Anders Hedenström says, per the Los Angeles Times. Actually, swifts are rather clumsy on the ground and their wings and feet not well suited to taking off from a flat surface, reports National Geographic, so it's safer for them up in the air. (Migrating birds are in trouble.)