It seems that I am focusing on African animals, but you may believe it or not: I sketched the first animal that came into my mind. I do it always in the same order: I open google image search and type in whatever comes to my mind at that moment. This time it was “gnu”. Then I browsed through the hundreds of images (stop! I stopped after the twentieth photo, I think), clicked on one I found especially impressive (the photo and the animal) and began to draw.
I used a pencil, but no eraser. It took me about half an hour.