The Craw's Nest

Struggled to find an entry today due to being en route between Fife and Aberdeen. By the time I got to Strathcathro Services on the A90 near Brechin (and had a cup of tea and a cake!), it was 1530 and getting dark. As it's just a basic truck stop, with not much around except road and trees, I took a quick snap of the bird nests opposite the cafe. How do I know they're crows? Until lots of the trees were cut down a few years ago it was eerily like a scene from the film "The Birds" - a large number of crows sitting in the trees, just waiting...