Can imply “the alternation of two musical tones a diatonic second aside” or “a audio resembling a musical trill.” The flute-like trill of your wood thrush is perhaps the most beautiful track of any North American chook. The descending trill of its relative the veery isn’t as well shabby, either. https://socialbraintech.com/story3621989/5-essential-elements-for-birdwithmostwords-com