a white swan with black and yellow bill sitting on the snow

avian aviary bare barren bill bird birds black calm chill chilling cold color colors colour colours cool duck ducks endanger endangered fall falling feather feathers field flight flightless float floating flu freeze frost frozen geese generic goose ground h5n1 homogeneous influenza land long low mute neck necked peace plumage quack quacking serene serenity sit sitting snow snowy spring swan swans swim swimming temperate temperature white wing wings winter yellow