Which bird has been recorded flying non-stop for 84 hours over 6,760 km?

The great snipe has been recorded flying non-stop for 84 hours over 6,760 kilometres.

That feat makes the great snipe one of the most extraordinary long-distance migrant birds. During seasonal movements between breeding grounds in northern Europe, including Sweden, and wintering areas in sub-Saharan Africa, some individuals make uninterrupted flights lasting roughly 60–90 hours. The recorded 6,760-kilometre journey is about 4,200 miles.

Great snipes are compact waders, only about 26–30 centimetres long, but they are bulkier than the closely related common snipe and have a shorter bill. Their migration is especially striking because the birds fly at high altitude—records have reached about 8,700 metres—while travelling thousands of kilometres without stopping to feed or rest.

A common mistake is assigning this record to the common swift, another famous endurance flyer. Swifts are renowned for spending long periods airborne, but the 84-hour, 6,760-kilometre migration record belongs to the great snipe. Whimbrels and red knots also undertake impressive migrations, but they do not match this documented non-stop flight.