Edmund Selous, The Bird Watcher in the Shetlands…
“ The eyes of an eider-duck are, no doubt, sharper than my own—or anybody's. Still I do not believe that even the most sharp-sighted one could find anything on this seaweed, at least without searching for it, whereas these ducklings are constantly dipping and, apparently, as constantly feeding all the way along. Finding always, they never have the appearance of looking for what they find. To me they seem to be browsing in their little ducking way, just as sheep browse in a field. ”
