This cow's skull has been on my backyard arbor for years. Recently, two Pacific Wren have starting using the skull as a nest. I originally wanted to get a shot of one of their heads popping out of an eye or horn hole. I was shooting on continuous and got several good shots, but was delighted to capture this one of the bird diving full speed into the nest entrance. This is my first wildlife photo and I couldn't be happier with it.
Shot on a tripod with 55-200mm lens. Minor post done in CS1 including overall corrections and enhancing the bird a titch.