Cuckoo Tracking Project

Help us follow Cuckoos on migration and discover why they are in decline

We’ve been satellite-tracking Cuckoos since 2011 to find out why they are in decline:

  • Since 1995, the number of Cuckoos has decreased by over 30%.
  • The Cuckoo is currently Red-listed as a Bird of Conservation Concern in the UK.
  • Find out how you can support our Cuckoo research >

Progress so far

We’ve learned lots of vital information, such as how the different migration routes are linked to declines, and some of the pressures Cuckoos face whilst on migration, but there is still much more to discover.

​What’s next

We now need to look more closely at how dependent Cuckoos are on, and how much their migration is linked to, the drought-busting rains of the weather frontal system known as the Inter Tropical Convergence Zone (ITCZ) as they move out of the Congo rainforest and begin to head back to the UK via West Africa.

Our Cuckoo Tracking Project is vital and it wouldn’t be possible without the amazing support from funders and sponsors.

There are two ways you can support us and make a positive impact:

Watch the Cuckoos migrate on our map

Each Cuckoo’s tag sends us location data approximately every day, so we can follow them and learn more about their migration.

Time / skill required

  • Spend as much time as you like following each Cuckoo's migration on the map below - use the controls to animate or step through their movements.
  • No technical skills are required to support this project - just a love of Cuckoos.

Cuckoo movements from 01 May 2023 to 26 April 2024

View routes starting..
Cuckoo positions on
 
 
 
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Current Cuckoos

Bluey. Bluey

Bluey

ID: 242385
Status: active
Cuach Carran. Cuach Carran Map Pin.

Cuach Carran

ID: 242389
Status: unknown
Cuach Cores. Cores

Cuach Cores

ID: 242386
Status: active
Cuach Torc. Torc

Cuach Torc

ID: 242384
Status: active
George. George

George

ID: 242387
Status: active
JAC the Cuckoo JAC

JAC

ID: 213805
Status: presumed dead
Jasper. Jasper

Jasper

ID: 232668
Status: unknown
Joe, Cranwich Heath, 2022. PTT 232670 Joe

Joe

ID: 232670
Status: active
KP. KP

KP

ID: 242388
Status: active
Cleeve (2023 tagged Cuckoo) Michael

Michael

ID: 242426
Status: unknown
Sayaan. Sayaan

Sayaan

ID: 242502
Status: active
Trent Trent

Trent

ID: 242383
Status: active

View previously tagged birds

Latest updates

Sayaan has France in sight

26 Apr 2024

After several days in the Andújar area, Sayaan has flown approximately 450km (280 miles) north to a mountainous region close to the town of Tarazona.

He is just 66km (41 miles) to the south of Trent and is headed for the French border. With favourable winds forecast, he could make good progress in the next couple of days.

Joe makes French connection

26 Apr 2024

Joe is the first of our tagged Cuckoos to reach France, having moved some 580km (360 miles) since his last location on the Spanish / Portuguese border.

He flew north-east, passing over Bilbao and took a little short-cut over the Bay of Biscay, arriving in the Nouvelle-Aquitaine region, in an area of coastal lakes just 75km (46 miles) south-west of Bordeaux.

KP approaches France

26 Apr 2024

KP has flown around 388km (241 miles) due north and is now in area of fertile plains just south of the Montaña Palentina Natural Park, in the province of Castile and León.  

Just 88km (54 miles) from the coast at Santander, will he head north before making a short crossing over the Bay of Biscay, or might he fly east and cross into France to the west of the Pyranees?

Browse updates from our Cuckoos

Project Lead
Email Contact:
cuckoos@bto.org

Project timeline, contributions & findings

Project timeline

  • 5/11 - First round of five Cuckoos tagged, wintering sites in the Congo identified 
  • 3/12 - Different routes discovered on return journeys
  • 2016 - First scientific paper published on on the routes of our Cuckoos