whistling

whis*tling

noun

{bc}the act or sound of one that {a_link|whistles} {bc}{sx|whistle||}

whistle

verb

{bc}to utter a shrill clear sound by blowing or drawing air through the puckered lips

whistling swan

noun

{bc}{sx|tundra swan||}

tundra swan

noun

{bc}a native North American swan ({it}Cygnus columbianus{/it}) that has a soft high-pitched call, breeds in the arctic tundra, and winters in shallow fresh or salt water especially along the eastern and western coasts of the U.S.