Northern Mockingbird, Mimus polyglottos - John James Audubon
Here Audubon captures the fierce nature of Mockingbirds in defense of their nest. As both naturalist and hunter Audubon's work exhibits the brutal reality of nature with great dynamism.
This image (Plate 21) was published life-size in Audubon's first edition magisterial "The birds of America", where the scale and the subtle tones of aquatint etching emphasised both the perils and vigour of nature.
You can see this image in more detail in Google Art and Culture.