Have just seen the first swallow this year, usually they arrive at the end of March down here in Haute-Garonne France, so they are late this year. I'm sure they will be on there way up to you all soon!
We have noticed a decline in birds and insects here in the last couple of years since our neighbour who was a cattle farmer retired and sold his cows. His fields are now rented out to another farmer who has ploughed them up for rapeseed. The set aside scheme ended here a few years ago allowing the farmers to destroy trees and hedgerows. They also love their pesticides here. I really do fear for the eco system here.
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https://www.forces.net/news/songbirds-illegally-killed-uk-base-falls-70