Yup, that's definitely a red squirrel! (Tamiasciurus hudsonicus if it was in North America) - looks to be a juvenile, too - born this spring. Red squirrels primarily eat the seeds out of pine, spruce, etc. cones, and so they're mostly found in coniferous forests, although they will branch out into berries, mushrooms, even carrion if it gets cold enough! Both gray and black squirrels are the same species, just different colour phases. The farther south you go you get more grays, and the farther north, more blacks. End of biology lesson...
Mike.
Nice shot, BTW!