It looks likely that BB, Peter, Skinner, Waller and Whortle have failed to complete their migration this year, or their tags are no longer transmitting, and so we will be moving all of them to the inactive section of the website.

From time to time we ‘lose’ one or two of our Cuckoos only for them to reappear several days, or even weeks, later. We are never entirely sure why this might be at the individual level but during the course of the project we have noticed similarities between some of the ‘lost’ birds.

We have lost some of our birds just prior to them making a large movement and we think that this might be because they move into denser vegetation in order to feed up before embarking on a long flight. Moving into denser vegetation may mean that the solar panel that recharges the battery for the tag is in shade for periods of time and the battery receives a poorer charge, which in turn results in poorer performance from the satellite tag.

Once the birds have put on enough weight to begin their journey they move into the open and the tag begins charging again and the birds ‘reappear’. We also see the same thing happen, although to a lesser extent, when birds complete a long movement and presumably move into denser vegetation to rest and feed up

Several of our Cuckoo tags have not sent transmissions for over 10 days; BB, Hennah, Peter, Skinner and Waller. 

This means they are not currently shown on the main map by default, although can be switched on using the tick boxes under their photos. It's not uncommon for Cuckoos to disappear for up to several months during mid-winter as tag charging conditions in the forest are poor so we won't really know their fate unless we receive further transmissions. If they fail to move northwards when expected then either the Cuckoo may have died or the tag may failed or degraded. Our greatest concerns are still for Peter and Waller who were in the same area when signals were last received, all the way back in October.

We are concerned about whether we will receive further transmissions from Peter and Waller. They were in the same area and just 5km apart from each other, close to the Congo river in Democratic Republic of Congo, when signals were last received. Looking at the map, they seem to be in an area of unbroken canopy so the solar-powered tags may not be able to charge as they are not receiving light. The worry when batteries cannot charge over several months is that they may start to degrade and are not then able to switch on again when they do receive light. We will have to wait and see whether we receive further signals from the tags in future. 

Six of the tracked cuckoos (Peter, Dudley, Emsworthy, David, Livingstone and Stanley) are already within the Congo rainforest block. The first of these to arrive was Stanley on 16 September, the earliest of the tracked cuckoos ever to arrive there by 12 days! He was followed by Emsworthy on 19 and Livingstone and Dudley on 23. Previous to this year, the earliest Cuckoo had been Chris, who arrived there on 25 September in 2012.

Since then, David arrived on 24 and Peter on 28 September 2014. David was five and four days earlier than in 2012 and 2013 respectively whilst Livingstone was 13 days earlier than last year. It is very interesting to note that all four of the cuckoos who beat the previous earliest arrival date came from northern Cameroon and the adjacent part of Chad, a region that has received over 50mm less rainfall than usual over the past month and more than 100mm less over the past three months.

With most cuckoos now in the Sahel region, we're entering a fairly quiet period in the annual cycle of the tagged cuckoos with less movement than during the migration season.

Birds who completed their desert crossing will spend time in the Sahel recovering their body condition, and some may stay quite a long time. In previous years, cuckoos have stayed in this area for as much as several months, while others spend a shorter amount of time before moving south into the humid zone forests.

The eastern Sahel in Chad and south Sudan has received plenty of rain recently, and thus conditions are likely good for cuckoos. Northern Cameroon was slightly drier than average in August, and so cuckoos such as Derek, Dudley, Stanley, and Emsworthy may be moving on if foraging conditions aren't suitable.

We are still following twenty-two birds. Currently two cuckoos are in France – Walpole and unnamed cuckoo 134957.

Five birds are in and around the Po Valley in northern Italy – BB, Chris, Stanley, Waller and Livingstone.

Six birds are in Spain – Two of these are big movers this week. After finally leaving the UK, Derek hasn’t hung around. After a brief stop in central-western France, he is now in central-northern Spain, just south of Tolbanos de Abajo. It is Maji that has provided the biggest surprise though. He seems to be taking a tour of the European mountain ranges. Having spent a time in the Austrian Alps, he is now in the central Pyrenees!

David is still in Montenegro and Ash is still in Croatia; both of these birds could make the move to Africa any day now.

We now have seven birds in Africa, six of them south of the Sahara. Emsworthy is the latest to arrive here and he is currently just south of Lake Chad, in an area that Chris also favours. Three other Cuckoos – Peter, Hennah and Dudley – are also close to Lake Chad.

New Forest bird Hennah recently moved to the south of Italy and is in the region of Calabria. Signals received throughout yesterday and toady show that Peter is following in his path and also heading south through Italy. Ths last signal received indicated he was still a little further north than his fellow New Forest bird, in the Salerno region, but he may well have continued his journey. We'll find out how close he gets when we receive further signals. 

Our New Forest birds seem to be taking very different routes. Gilbert has recently moved futher west to Portugal from his previous location in Spain, while Hennah is still north-east of Rome in Italy with Peter just a little further north, remaining in the Po Valley.

From France, via Corsica, Ash appears to now be in Italy. He joins Hennah, who had also been in France and perched in the Pyrenees close to the France/Spain border but who also recently changed direction and headed to Italy to take this more easterly route. Whortle, Peter, Waller, and Livingstone are all also currently in Italy. 

With three un-named birds left we are letting you choose what to name one of our Sherwood Cuckoos!  Anyone who sponsors a Cuckoo before the end of June will be entered in to a draw. We’ll then pick one entry at random and will contact the winner who can then suggest a suitable name*. Find out how you could name a Cuckoo. 

Emsworthy has travelled over the border from France to join Whortle, Livingstone and Peter in Italy. Livingstone and Peter are in the Po Valley, an area that the project has shown to be important to many of our Cuckoos,  while Whortle and Emsworthy are currently close to the valley edge. 

Emsworthy's move this year, from France along and into Italy, looks remarkably similiar to Whortle's movement last year, just before he suprised us by retreating back to France and then down through Spain to Africa.  This year Whortle has headed straight to Italy and not stopped in France as far as we can tell. Will he head through Spain as last year or make the flight to Africa directly from Italy? Which route will fellow Devon Cuckoo Emsworthy take? 

Whortle, Chester and as yet un-named 134952 are the most recent Cuckoos confirmed to have left the UK. All three of these birds have travelled to north-western France, transmitting these updated locations on 19 June.   

Poor quality signals received on the same day indicate that two further Cuckoos have started their journeys. Hennah and Meavy look like they are in France too but until further locations are received to confirm this the maps won't update.

So we have at least 8 and possibly 10 Cuckoos which have left the UK. If the unconfirmed locations are true, then interestingly, all three Dartmoor birds (Emsworthy, Whortle and Meavy) and all three New Forest birds (Peter, Gilbert and Hennah) have left.  In addition one Scottish bird, 2 Nottinghamshire birds and one of the Sussex birds have also left the UK. 

It's only early June but our first Cuckoo has already left to start the journey to their wintering grounds! Recently named Peter, one of our New Forest Cuckoos tagged this year, had made it to northern France by the 8 June. This is early for our Cuckoos but by no means the earliest. In previous years Cuckoos have left as early as 3 June. Who will be next to follow?    

Bolderwood, New Forest, Hampshire -  Six Cuckoos caught between 04:30am and 11:00am - the first three of which (two tagged, one too small) were in the first round, one in the middle of each of a triangle of nets set at Bolderwood. The other three were caught a couple of miles to the north and four were selected for tagging. This meant we completed our tagging in Hampshire during day, in a brief weather-window.