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Updates from our Cuckoos

Read the latest updates from our Cuckoos on their migration.

PJ is back again!

24 Apr 2021

After five years and a staggering 50,000 miles, Suffolk Cuckoo PJ has once again returned from Africa to his breeding grounds in the King's Forest, Suffolk. He is the first of our tagged Cuckoos to survive five complete migrations with his tag still functioning. When we last updated you he was having a well deserved rest on the Isle of Wight, but despite the many attractions of that fine place, it couldn't keep him away from East Anglia for long. New updates received from PJ's tag at 07:30 yesterday morning (Friday 22nd April) showed that he had covered the final 223km (139 miles) from the Isle of Wight to Suffolk. Further updates since show him flying around his breeding grounds, less than 5 miles from us here at BTO HQ in Thetford. He will stay here until early July before beginning his journey back to Africa once again.

PJ takes a break on the Isle of Wight

22 Apr 2021
New updates received from PJ's tag just before lunch yesterday (Wed 21st April) showed that he had flown 866 km (539 miles) north, over France and across the English Channel to his new location on the Isle of Wight. We received further updates from his tag yesterday evening showing him in the same area, on farmland close to the village of Havenstreet, just south west of Ryde. It is now just 223 km (139 miles) as the Cuckoo flies, back to his breeding grounds in the King's Forest, Suffolk. In previous years he has arrived back at his breeding grounds between 18th and 30th April so he is being very punctual. When we next update you, it will hopefully be to tell you that PJ has successfully made it "home".  

PJ getting closer

19 Apr 2021
Updates received from PJ's tag just after 5am this morning show that he has flown a further 371km (231 miles) north east into northern Spain. He is now close to the shores of the Urranaga Reservoir, some 40km south east of Bilbao. How long will he linger before flying on? We will be keeping a close eye on the weather forecast over the next few days to spot likely opportunities that PJ may take to press on. Stay tuned!

PJ arrives in Spain

15 Apr 2021
Undeterred by the small feat of having just crossed the Sahara, PJ has pressed on, flying a further 751 km (476 miles) north and crossing from Morocco into Spain. By 5 pm yesterday evening he had made it to Central Spain. He is now just west of the town of Candeleda in the province of Avila in Castile & Leon. He is on the lower slopes of the Sierra de Gredos mountain range. He could be back in Suffolk by the time we receive the next update so stay tuned!

PJ crosses the Sahara!

15 Apr 2021

We caught and tagged Cuckoo 'PJ' in the King's Forest, Suffolk, in June 2016, and since then he has provided us with a wealth of valuable data. Through tracking PJ's migrations between UK and Africa, we have discovered that he spends the winter months in north-western Angola. Recently, while en-route to the UK he has spent several weeks feeding up in Ivory Coast and over the last few days we can see that he has tackled the mighty Sahara. He was in, or over, Mauritania on Sunday morning and by 8am yesterday morning (Monday) he had reached Morocco! The most recent update, which arrived at 19:40 last night, showed him in northern Morocco. He is currently in the Middle Atlas Mountains, approximately 95 km (59 miles) south east of Fes. From here, he will move up through Spain and France before crossing into England.

If he makes it back to Suffolk this year, PJ will have completed his fifth tracked migration, which is the most for any Cuckoo that we have tracked so far! It has been a nerve-racking time waiting for PJ to tackle the desert and we'll be keeping everything crossed that the rest of his journey goes smoothly. In previous years, he has successfully completed his desert crossing between 7th and 17th April and arrived back at his breeding grounds in Suffolk between 18th and 30th April, so he is close to his usual schedule.

The end of the road for Valentine

19 Mar 2021

Sadly, it looks as if we have heard the last from Valentine. When his tag last transmitted, the battery in his tag was low on charge and had been for some time, but there's also an indication of a problem based on temperature. The temperature sensor in the tag reported about 8 degrees C lower than any of the previous readings in Angola, including those from similar times of day, and we don't think the move north by a few hundred km explains this. We suspect that Valentine perished between the last location in Angola (2nd Feb) and the ones in southwest DRC (16th Feb). Valentine was tagged in June 2019 so we have benefited from a lot of valuable data from Valentine, helping us extend our knowledge and understanding of this amazing species.  

No further news from Carlton II

19 Mar 2021
We've had no further messages from Carlton II's tag since 26 Feb when he was in the forest zone of north eastern Gabon. Although the tag's battery was very low at the time, based on the data collected by the onboard temperature sensor, there's no indication of a problem with the tag. Hopefully we will hear from Carlton II very soon.

PJ still in Ivory Coast

19 Mar 2021

PJ, who is on his fifth tracked annual migration to the UK from Africa, has spent the last couple of weeks in Ivory Coast. The rains are well established in the area that he's stopped off in - in fact, there's been a bit more than expected over the past month (up to 75mm). This should mean there's plenty of food for him. We don't know exactly what he'll be feeding on but expect that this will include some adult insects that have been aestivating over the dry season and have emerged in response to the start of the rains.

The area PJ is in was originally deciduous forest that has been transformed into secondary growth - this transformation might originally have been beneficial for Cuckoos, but depending on the extent of tree loss, it could reduce habitat quality for them. As it's now a few weeks since the rains commenced, it's likely that in addition to emergent insects, there could also be plenty of caterpillars (Cuckoos preferred prey on the breeding grounds) for him to eat by now. He's likely to use this fuel to put on fat amounting to at least 50% of his lean body mass, as well as enlarging his flight muscles, before migrating over the Sahara. He usually spends most of March in Ivory Coast before heading north across the Sahara.

PJ arrives in Ivory Coast

01 Mar 2021
PJ is sticking to his usual flight plan so far this year and after a brief stop in Ghana has flown a further 507 km (315 miles) west to Ivory Coast. He is now close to the river Nzi, approximately 100 km north east of the capital Yamoussoukro. He knows Ivory Coast well having stopped here in every year we have tracked him. In some years he has spent time in the far west of the country, close to the border with Liberia. We expect him to spend a few weeks here, during which time he will be feeding up in preparation for his Sahara crossing. 

Valentine on the move?

27 Feb 2021
A low quality location received from Valentine's tag suggests that he may be on the move from Angola towards Democratic Republic of Congo. Hopefully he will emerge from the forest canopy soon and his tag will receive enough sunlight to send us a more reliable location.


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