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The big influence for this picture (though obviously not in terms of panoply) was Ralph Horsley's lovely illustration on page 101 of Wyrms Footprints. Ducks 101 indeed! Obviously, everyone's ducks will vary, but I really liked how Ralph expressed the duck part of 'anthropomorphic ducks'. The short, thin bird's legs; the swollen belly and rump; the large head; the exaggerated (relative to humans) proportions. I like my ducks to waddle just a little, after all!
My own sketches are slightly more anthropomorphic than Ralph's (as much by accident as design, at times), but that picture will always define ducks for me.