Cuckoo Tracking Project

Help us track Cuckoos and learn even more about their epic migration

We’ve been satellite-tracking Cuckoos since 2011. 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.

An important aspect of this project is how it helps us improve our understanding of why Cuckoo 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.

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

Sponsor a Cuckoo

​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.

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 2024 to 20 April 2025

View routes starting..
Cuckoo positions on
20 Apr 2025
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Current Cuckoos

Cleeve

ID: 262930
Status: active
Cuach Cores. Cores

Cuach Cores

ID: 242386
Status: active
Cuach Torc. Torc

Cuach Torc

ID: 242384
Status: presumed dead
Cuthbert, tagged Cuckoo, 2024 cohort / BTO

Cuthbert

ID: 262937
Status: presumed dead

George 2

ID: 262934
Status: presumed dead

Hafren

ID: 262938
Status: active

Henry

ID: 262933
Status: presumed dead
Joe, Cranwich Heath, 2022. PTT 232670 Joe

Joe

ID: 232670
Status: active
KP. KP

KP

ID: 242388
Status: presumed dead

MacSporran

ID: 262931
Status: deceased

Nick 2

ID: 262928
Status: presumed dead
Sayaan. Sayaan

Sayaan

ID: 242502
Status: active

Severn

ID: 262932
Status: presumed dead
Trent Trent

Trent

ID: 242383
Status: presumed dead
Wilfred, tagged Cuckoo, 2024 cohort / BTO

Wilfrid

ID: 262936
Status: active

View previously tagged birds

Latest updates

Corking news from Cuach Cores

22 Apr 2025

After a few days resting and feeding in northern Spain, Cuach Cores has powered on and headed straight for Ireland. Crossing the Bay of Biscay, he took a direct route of around 1,200 km (745 miles), skirting the Isles of Scilly, and arriving in County Cork this morning (22).

He is currently just 70 km (43 miles) to the east of Killarney National Park, where he spent last summer, and also where  he was first tagged in 2023. He has arrived back in Ireland 18 days earlier than he did last year.

Wilfrid wings his way

22 Apr 2025

Once again, Wilfrid went quiet for a short while, leaving us guessing as to his whereabouts following his arrival in central Spain in early April. Our last signal placed him near Guadalupe, then over the weekend we received notification of his arrival in Suffolk – our first tagged bird to return!

He is back in the same area near Worlingham Marshes, within the Broads National Park, where he was tagged in early June last year, further highlighting just how site-faithful these birds are!  

Sayaan says salve!

16 Apr 2025

Since our last update just two days ago, Sayaan has flown more than 2,000 km (1,242 miles) from central Algeria, to southern Italy. He is the only one of our current crop of tagged Cuckoos to take an easterly route.

He is currently in an area dominated by lush woodland, in the hills just 35 km (21 miles) west of Genoa.

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