Bird photography practice

I made these pictures today with my Nikon 3300 and a Nikkor 55-300 lens. It was cloudy, so I used the widest possible aperture and shot in aperture priority. I love the bokeh effect that it achieves. Also used exposure compensation +0,3. I was at a feeder, so the birds were quite close to me, except the raven which was at the top of a tall tree.