Swifts, medium-sized migratory birds that share a resemblance to swallows, might spend most of their lives in flight. Researchers devised a way to track their flight patterns, how often they stopped for rest and flight durations. What they found out left them astounded. It turns out that Swifts can spend up to 10-months in flight, with no rest. Anders Hedenstrom of Lund University in Sweden said in a statement, “This discovery significantly pushes the boundaries for what we know about animal physiology. A 10-month flight phase is the longest we know of any bird species — it’s a record.”