We drew anything that stayed still long enough to be drawn. It's so relaxing to occasionally take time to do some observational sketching out in the real three-dimensional world.
I also discovered that the Alligator Snapping Turtle is one of the most intimidating life forms on the planet. Every line and spike of it says "Mess with me and you'll lose one of your soft pink appendages." I would have sketched it, but turns out it's also angry and disinclined to cooperate, so here's a photo instead.