I am Happy to hear you finally have your Sigma 150-600mm lens my friend. I can tell that I am very happy with mine, but I also needed a little time at the beginning to get familiar with it. Now I would never like to miss it. I wish you a lot of happy moments with your new Lens!
PS: The Siberian chipmunk is so cute, very nice picture! I also like the Ural Owl. Owls are always so special I think.