Lyster and Kasper were both caught on the morning of 25 May 2011 in an area on the outskirts of Martham in the heart of the Norfolk Broads. The nets were up by 03.15 and we knew that there was a good chance of catching a bird as there were at least 6 in the area. Soon enough, we caught a male and this became our third bird of 2011. Not long afterwards Kasper flew into the nets.
No further signals have been received for John or Reacher since their last locations in France and Spain respectively. Taking a look back at the temperature data, the last few messages received for each tag show a lot of variety associated with time of day - i.e. cooler in the early morning and reaching over 30°C in the afternoon. Temperatures prior to that had always been higher than 30°C, even when the Cuckoos were in Britain. This suggests that the bird’s body temperature wasn't influencing the tag's temperature much during these signals and does, unfortunately, support the idea that they may have perished.
The wildfires that have spread through Spain have been caused by chronic drought. While the wildfires themselves are unlikely to have effected these Cuckoos directly, the drought will have made Iberia far less suitable for fattening Cuckoos.
John behaved very oddly once he got to north-eastern Spain and even made an oblique re-crossing of the Pyrenees, and Reacher disappeared in exactly the area where the recent fires have been reported. Lyster took a similar route, passing through Catalonia (one of the areas where fires have been reported) during late July and stopping off in what appeared to be an area of irrigated farmland rather than the montane forests he used last year. Perhaps he failed to deposit enough fuel for the desert crossing at this sub-optimal stopover location? .