Can necessarily mean “the alternation of two musical tones a diatonic second aside” or “a sound resembling a musical trill.” The flute-like trill of the wood thrush is Probably the most attractive tune of any North American bird. The descending trill of its relative the veery isn’t too shabby, both. https://bookmarkstumble.com/story19898429/the-basic-principles-of-birdwithmostwords-com