Hello. I am wondering if anyone can help me identify a bird I saw this morning. The bird appeared to be black (though it may have been a dark gray or brown) and the lower 1/3 to 1/2 of its wings were white. It was larger than a blue jay, but smaller than a small crow. It was near a stream that runs by the county office complex, flying over the parking lot towards the water, and I lost sight of it once it crossed the stream. It was about 20 feet up, and flying at a good pace. This was in the Hudson Valley area of NY.