Can necessarily mean “the alternation of two musical tones a diatonic 2nd apart” or “a seem resembling a musical trill.” The flute-like trill with the wood thrush is Probably the most lovely song of any North American hen. The descending trill of its relative the veery isn’t as well shabby, https://socialwebleads.com/story3684203/birdwithmostwords-com-things-to-know-before-you-buy