Cuckoo Tracking Project

Cuckoo. Alan McFadyen

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

The Cuckoo is currently Red Listed as a Bird of Conservation Concern in the UK, due to its population decline.

Since 2011 we’ve been satellite-tracking Cuckoos to find out why they are declining. We’ve learned lots of vital information which could help us to understand our Cuckoos, such as how the different routes taken are linked to declines, and some of the pressures they face whilst on migration — but there is still more to discover. We now need to look more closely at how dependent they 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.

Follow our Cuckoos as they move to and from Africa.

This project wouldn't have been possible without the amazing support from funders and sponsors. Read more about the project and find out how you can get involved.

We have been able to share our expertise around tracking Cuckoos with other international studies, such as the Beijing Cuckoo Project.

Skill required

  • Follow our Cuckoos on the map below - use the controls to animate or step through their movements.

Cuckoo movements from 02 May 2021 to 15 May 2022

View routes starting..
Cuckoo positions on
Show markers
Show routes
Show all birds

Current Cuckoos

AJ the Cuckoo AJ the Cuckoo


Status: active
Attenborough the Cuckoo Attenborough the Cuckoo


Status: presumed dead
Calypso the Cuckoo Calypso the Cuckoo


Status: active
Clive the Cuckoo Clive the Cuckoo


Status: unknown
Columbus the Cuckoo Columbus the Cuckoo


Status: unknown
Daniel the Cuckoo 50042 the Cuckoo


Status: active
Ellis the Cuckoo Ellis the Cuckoo


Status: active
Grove the Cuckoo Grove the Cuckoo


Status: unknown
Harry the Cuckoo Harry the Cuckoo


Status: unknown
JAC the Cuckoo JAC the Cuckoo


Status: active
Cuckoo 161318 portrait Cuckoo 161318 map marker


Status: active
Victor II the Cuckoo Victor II the Cuckoo

Victor II

Status: active

View previously tagged birds

Latest updates

Daniel is back at Lake Vyrnwy

06 May 2022
Further updates that arrived yesterday morning showed that Daniel had completed his journey back to his breeding grounds at Lake Vyrnwy. Having had such a long period during the winter when we received no updates from his tag, we are delighted that not only did his tag come back to life but that he has successfully completed his migration. 

Calypso is back again

05 May 2022
New updates from Calypso's tag last night showed that he was within a stone's throw of his tagging location at Wildgoose nature reserve in Worcestershire. He was tagged here on 19 May 2021 and stayed until 23 June so we expect him to remain on site for the next six weeks or so. Bravo Calypso!

Daniel is back in Wales!

05 May 2022
Daniel has flown 843 km (524 miles) since our last update, taking him from Central France to mid Wales. A new update received early this morning showed that he was just north of Welshpool, just 30 km (18.6 miles) from his tagging location on the shores of Lake Vyrnwy. He left his breeding grounds on 3 July last year so we expect him to stay for around 8 weeks. So if you are visiting RSPB's wonderful Lake Vyrnwy reserve or the surrounding area over the next couple of months, listen out for Cuckoo Daniel!

Browse updates from our Cuckoos

Project Lead
Email Contact:

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

Support the project

You can help keep this important project going by either giving a donation, becoming a Cuckoo sponsor, or gifting a sponsorship to someone else. We greatly appreciate the support the project has received, allowing us to continue to monitor this endangered species.

Related content