Yesterday I saw bluejays and a chipmunk. Today: take away the chipmunk, add a SQUIRREL! Fortunately my dogs didn't see it, or if they did, they didn't scream it and start after it.
These were all shot hand-held through my computer "room" window, which really should be cleaned, but considering it's over 10' above the ground, I don't know that I want to do that!
Bluejay: [edit^2: Moonhare identifies them as Stellar's Jays, I saw three of them in my front yard this week!]

I don't know how the tail is in focus and the head is not, blame it on a 300mm that when multiplied is effectively a 480mm at f5.6. I'm considering bringing in my monopod. The bluebird wasn't very cooperative in terms of staying in sunlight and holding still or posing.
Squirrel run across felled tree:

Squirrel run down tree:

Squirrel run up same tree, moments later:

Not as sharp as I'd like, but all things considered, not bad.
EDIT: my wife said they're Jays, not just Bluebirds. I didn't spend any points in Ornithology, they all went in to computer skills and photography. Recently my XP has been going in to cooking/baking and video editing.