An incredibly exciting moment ---- a very rare encounter with a wild wolf, in Banff National Park. I found out that this is the alpha female of the pack, and you can see that she is also wearing a GPS collar. I had about 15 seconds with this fantastic animal, and fired off 20 shots. This is my favourite.

Canon 1DX, 500 mm f/4 LII lens, 1/800 sec @ f/4, ISO 1250