A Bar Tailed Godwit has been tracked from its summertime home in New Zealand to its breeding ground in Alaska and and back again.
The female, nattily called E7, set her first record on the way north, when she flew non-stop for 10,200km (6,340 miles) to Yalu Jiang in China. She then flew a further 5,000km (3,000 miles) to the godwit breeding grounds in Alaska. E7 though went and smashed the record on the way back with 11,500km (7,150).
The tracking of the return trip was a bonus as the implanted tag lasted longer than expected.
Seabirds feed as they travel across the ocean but apparently Godwits just keep going.