The 100-400 is exceptional, so much so in fact, that I repurchased it a few weeks ago after selling it off to get this DO II that won't happen again. These days though, I'm using the DO II + 1.4xIII pretty much all of the time on my 80D, while the 100-400 serves as my "wide angle" zoom on the 5D4
Love Mockingbirds. They are my favorite visitors out back, even fly right up close to me and land. None of the other birds will.
I noticed that too! They're very inquisitive, and fiercely territorial, so are less shy about approaching. It's a nice reprieve to have some easier subjects to photograph after chasing elusive species all over the place! The Mockingbirds, and the Black Capped Chickadees, are the easiest. Cardinals, Blue Jays, and Downy woodpeckers are medium difficulty when attempting to get close to. Red Bellied Woodpeckers and hawks are aggrivatingly difficult! King Fishers are next level clever, haven't solved that riddle yet.