Which bird can fly the longest?

Many people may consider a long aeroplane journey, for example to Australia, to be far and difficult, but this is incomparable to what the common swifts can do. They can fly for 10 months!

Although back in the 1970s ornithologist Ronald Lockley allowed such an ability in the common swift, it wasn’t until 2016 that a team of researchers from the University of Lund, Sweden, confirmed it.
The team tracked 13 adults by tagging them with small devices to record flight data. It turned out that some swifts spend only a couple of months on the ground during the breeding season, and the rest of the time they are in flight. This is an impressive achievement for such a small bird, weighing around 40 grams.