Have had 4 close encounters with falcons (2 Peregrines, 2 Merlins), two of which completely turned my life around. A third happened a few hours after I told someone else about the 1st one. [I am about to do a 7 hour drive through the Pennsylvania countyside so #5 may be soon in coming]
It’s a 2013 Kenworth Extended Day Cab. And what I’m driving to my retirement.
As of 9/17/22 >>> 403 days (but who’s counting?)
Lucy
It’s a photo of one of my very favorite puzzles. You can build all sorts of shapes with these pieces, and they are fun to play with.
I collect puzzles. Yes, my name is puzzle gal, not puzz legal.
Gee, I dunno.
It’s a photo of a previous resident of my place.
I didn’t choose the hippo; the hippo chose me.
I always thought your avatar was an actual photo of Einstein until your post motivated me to zoom in and see that it’s a dog.
Don’t worry, I’m not going to sue you for false representation of an Einstein. 
When we were first able to pick avatars, I tried to find a photo of Ray Liotta as Shoeless Joe Jackson from “Field of Dreams”. But I didn’t like any of the ones I found, they were too dark or just hard to tell who it was. (I think on the old boards we were limited to 100x100 px.)
Then, as a joke I thought hey, I should use a photo of the other Joe Jackson, the musician. Then I remembered the album cover from “Look Sharp”, with the shoes, and it all just seemed to fit in a weird sort of way.
The phrase “when pigs fly” has always had a certain resonance for me as the standard for the nearly impossible, although I’m not sure why. One day I shall write that perfect post, and everyone will read it with awe. Yeah, right …
I like how Yoshi looked back in the 90s. He just looks so chilled out without a care in the world.
Hmm… not sure…
I like to think that I didn’t choose it, it chose me.
I’ve been working for our city’s public works department for over twenty years and for the traffic engineering section for - - getting close to five years now.
It relates to my username (for non-American Dopers, it means “Caution: Slow Moving Vehicle”, and is typically used by the Amish on their buggies, or I think sometimes on farm equipment - any vehicle on a public road that can’t move at traffic speeds). It’s also simple, and easy to figure out; I like to think it represents me well.
I wish I could remember the Doper who helped me figure out how to scale it and add it to my profile; I’m fairly computer-illiterate. Which is how I chose my username to begin with - on the information superhighway, I’m the one in the buggy marked “Caution: Slow Moving Vehicle”.
It’s a tribute to a very dear, beloved friend:
My son put it together from stock caricatures. It doesn’t really look much like me, although I am bald, white-bearded, and frequently wear flannel shirts like that.
Finding an avatar of Teela Brown was pretty much impossible. Also, I don’t want to be one of those older women who choose avatars that are much cuter and younger than who they are, and Teela Brown is certainly that.
So I selected one in my own age range and thought Mom does the job admirably. Plus she’s as pissy as I sometimes feel.
“Who smells like freaking porpoise hork?!”
I find it amusing to use an avatar that is a shapeshifting master of darkness . . . who at the moment in question is a frog. Because frogs are somehow unspeakably funny to me.
Especially with giant googly eyes that ARE ON FIRE!
I’ve always imagined that you look exactly like your avatar.
It looks like AKU, from the Samurai Jack cartoon series.