Robert McCracken Peck has another gorgeously illustrated article in Landscope (vol. 28, no. 2, summer 2012-13, pp. 11-17), the quarterly journal of Western Australia’s Department of Environment and Conservation: A Passion for Parrots: Edward Lear Down Under. Unfortunately the magazine appears to be print only, from the link above you can buy a copy, and here is a working sketch of a sulphur-crested cockatoo, from Houghton Library MS Typ 55.9 (62), that illustrates the article:

As a bonus, here is an Edward Lear self-caricature I found on my hard disk; unfortunately, I can’t remember where I got it: