The following links might be useful pre-thinking, especially the last one.
The truth about human nature: human or individual? (Google Arts and Culture)
An animal instinct (Google Arts and Culture)
The art of coexistence: man in the realm of nature (Google Arts and Culture)
Human nature: the survival of the fittest
Desires and societal expectations
Instinct expressed through visual arts (Google Arts and Culture) - an interesting read with art examples
LOVE ME OR KILL ME by Sarker Protick
Art work using animals:
Drawings of animals
Animals in art (many examples) on Flickr
Barcelo, Miguel (1957- ) - 1999 Floquet de Neu (Christie's Paris, 2009) Mixed media on canvas.