Episode
The Bird That Flew 7,000 Miles Without Landing
In 2007 a bar-tailed godwit called E7 flew from Alaska to New Zealand nonstop: 11,680 km in about eight days, tracked by satellite.
Updated
Case Files · Episode 1 · 15:55. Long-form episode; the video player arrives at public launch.
What the episode is about
In 2007 a bar-tailed godwit the scientists called E7 flew from Alaska to New Zealand without landing once: 11,680 kilometres in about eight days, tracked the whole way by satellite. Every date and distance comes from the scientists' own reports.
Key facts
- E7 flew 11,680 km nonstop in about 8.1 days (Gill et al., 2009).
- Sixteen godwits were fitted with satellite tags at Miranda, New Zealand.
- Where reports disagree on a date, the episode uses the peer-reviewed paper and says so.
Further reading
- Breeding males brick-red: Cornell Lab of Ornithology, Birds of the World (Bar-tailed Godwit)
Scenes are painted and dramatized from the sources below. Where accounts disagree, the episode says so.
More from Case Files
- The Dog Who Walked 2,500 Miles Home
- She Was Banded in 1956. She's Still Coming Back.
- This Dog Waited at a Train Station for Almost 10 Years
Sources
- E7's tagging, route, dates (17 Mar, 1 May, late Aug [sources differ 29/30 Aug], 7 Sep 2007), 16 tagged birds, 5-week layover, 4,500 mi/5 days to Alaska, 125 mi west of Kauai, date line ~300 mi NNE of Fiji, North Cape, landfall 8 mi from cap
- 11,680 km in 8.1 days; seven tagged females 8,117-11,680 km nonstop; implanted transmitters; open questions (sleep, navigation); "ecological corridor rather than barrier?": Gill, R.E. Jr. et al. (2009) Extreme endurance flights by landbirds
- ~10,200 km northbound leg, Yalu Jiang on the China-North Korea border: National Geographic News (2007)
- Tagging partners (USGS Alaska Science Center, PRBO, Massey University, Pukorokoro Miranda Shorebird Centre, Global Flyway Network): Pukorokoro Miranda Shorebird Centre, "E7 - a Godwit on a Mission"
- Fat ~55% of body mass and shrunken digestive organs ("Guts don't fly"): Piersma, T. & Gill, R.E. Jr. (1998) The Auk 115: 196-203.
- Mean mass ~367 g of departing godwits; fat ~55%: Piersma, T., Gill, R.E. Jr. & Ruthrauff, D.R. (2021) Frontiers in Ecology and Evolution 9: 685764.
- Departure timed to winds; 24 tracked birds chose the best wind days; course changes around storms: Gill, R.E. Jr. et al. (2014) Animal Behaviour; USGS release
- 4BBRW (2020), ~12,000 km in about 9-11 days (sources differ: Miranda tracking team ~9 d; BirdLife ~11 d); flyway population; baueri ~155,000; nearly all baueri pass the northern Yellow Sea: BirdLife International
- 13,560 km in 11 days 1 hour (tag 234684, Oct 2022, Ansons Bay, Tasmania; ~5 months old): Guinness World Records, Longest non-stop migration by a bird
- ~28% of Yellow Sea tidal flats lost (1980s to late 2000s): Murray, N.J. et al. (2014) Frontiers in Ecology and the Environment 12: 267-272.
- Shorebirds relying most on the Yellow Sea declined fastest: Studds, C.E. et al. (2017) Nature Communications 8: 14895.
- Near Threatened: IUCN Red List / BirdLife International species factsheet
- kuaka: Te Aka Maori Dictionary
- Bar-tailed godwit calls: "Bar-tailed godwit.ogg" by Jamescandless, Wikimedia Commons, CC BY 3.0
- Barn owl screech: "American Barn Owl Screech.flac" by Daniel Polin, Wikimedia Commons, CC BY 4.0
- Coastlines: Natural Earth (public domain)
Scenes are painted and dramatized from published research; animal-sense views are illustrations, not measurements.