Over the winter the constant alarm call ceased. However about a month ago it started again! Must be the same two birds. The alarm call is again constant. Early am to late pm with barely a break. Again no obvious signs of danger around. Haven't managed to spot a nest. Any ideas what is going on??
I've lived in the same house for about 8 years. Lots of birds in that time. Nothing like this. The blackbird alarm calls started last spring, continued (about 15 hours a day) until about October. This is surely unusual. What's going on???