Many of my sketches are made in pencil or biro and some of the larger pictures are in charcoal. I like to experiment with different media when drawing animals. I particularly like drawing in biro, as it is very striking and immediate; I need to commit to the marks as I don't draw in pencil first and this gives the drawing an energetic quality. I usually use biro for my reference drawing and also when sketching my dogs, so it has become a very natural way of working.