Crows are a Threat to My Garden Birds

I have been deliberating lately as to whether the Crows (see recent posts) are actually a significant threat to my garden birds, especially the youngsters.
The trio of Crows (The Crows Around my Garden) became four and have then been joined off and on by other itinerant individuals. I mentioned before how I found them amusing and enjoyed watching their antics and comic displays but began to be