Edmund Selous, The Bird Watcher in the Shetlands…
“ The razorbill's mouth, inside, is of a conspicuous light yellow, which, when exposed suddenly to view, contrasts very forcibly with the black of the beak and upper plumage. In dalliance these birds throw the head straight up into the air, and, opening their clean-cut bills, so that one sees the gay interior like a line of bright gamboge, utter a deep guttural note, which is prolonged and has a vibratory roll in it, like the cry of the gorilla when angry—si parva licet componere magnis—as described by Du Chaillu. ”
