Jus' out shootin' robins

I have to take what I can get, anymore. I'm a lot weaker and shakier now than even a couple--3 years ago. Both the 100-400L, the 20-200 2.8L, and this 300mm 2.8 L are very big, heavy lenses. A 7D is not exactly light, either. Only way I can shoot is to crank the shutter speed WAY up