I tell myself the hirundines are all just late; but we know there's drought and insect loss (and pesticides) affecting watering holes and feeding places in mainland Europe, Spain and France, on their long journey from Africa. Insects and birds both – like all life – are also susceptible to EMFs, especially 5G.*
I'm heartbroken at this. If you have seen any or many, please do post that in the Comments section.
We really can't keep ignoring species loss – as big a problem for the rest of the natural world as climate change – and of course the two are inexorably linked.
* 5G: see here.