Alice Hall Walter, Wild Birds in City Parks
“ The identification of birds depends quite as much upon accurate observation of their size, motions, flight, characteristic attitudes, manner of feeding, company, song, call-notes and haunts, as upon details of form and color. Especial care is necessary to insure correct estimates of size for the reason that living birds often appear smaller to the unpracticed eye than they actually are. The familiar English Sparrow is a convenient standard of size because it is usually at hand in our city parks for instant reference. ”
