Unsure of 1st day of spring...but that's when birds begin their mating and nesting. Too early for the cuckoos work! So it has to be start of summer for the cuckoo to cuckoold (ie Chas & Camy nikers)......wicked, I know! tee hee
I live in Bucks and there is a cuckoo outside my house somewhere - it has been cuckooing for several weeks! Since the first bit of good weather I think. Had not heard one for years until now!