scientificillustration:

William Cooper (Bill) has painted professionally since 1964. His career began as a landscape and seascape artist and then he turned his talents to his first love, birds. Bill has illustrated numerous books and his work is purchased by institutions and collectors from around the world. Here is a short overview of his recent book “Capturing the Essence - Techniques for Bird Artists”

http://www.williamtcooper.com.au/books/capturing-essence-techniques-bird-artists/