Took the train up into the Lee Valley on Saturday for the Savi's Warbler at Seventy Acres Lake - only the fourth ever for the London recording area. Sleeping in (!) and the two hour journey meant I didn't arrive until mid-morning by which time it had gone quiet. This warbler has a strange cricket-like song so I decided to make a sound recording, knowing that a photograph was out the question considering its location out in the reedbed - about 80 metres from the footpath. It briefly sang around 1130h but the output from many other species including Nightingale, Whitethroat, Reed Warbler, Garden Warbler and Cetti's Warbler was still high and it was difficult to hear. I explored the rest of River Lee Country Park throughout the day, planning to return in the evening for another chance. Found around 70 species including Hobby (8+) and Marsh Harrier (imm female) and a few dragonflies including Hairy Dragonfly. Ten warbler species later I joined an assembled crowd of around 50 already listening to an evening performance of the reeler. A sound recording was a bit of a long shot but my new Sennheiser microphone managed to pick it up - ok, not a quality recording at 100 metres range, but enough to ID it on a sonogram. Continuous phrases or strophes were much shorter than the more familiar Grasshopper Warbler, typically less than 30 seconds - see the comparison below with a Gropper I recorded in Scotland a few years ago.
Larger versions here: www.fssbirding.org.uk/sonagrams.htm