On my way there I saw an amazing number of Swifts over one single field of oilseed rape. There must have been c500 of them – at least. And they were over just the one field, on the right hand side of the road. The wheat field on the other side of the road had no over-flying Swifts. And nor did the adjacent oilseed rape field either. There must have been something going on, insect-wise, in that one field to attract so many scythe-winged insectivores.
I thought I’d investigate on my way back – but over lunch, which was lovely, there was a thunderstorm and heavy rain. When I returned, with time to investigate, there wasn’t a Swift to be seen.