Noun birdcall has 2 senses
  1. birdcall, call, birdsong, song - the characteristic sound produced by a bird; "a bird will not learn its song unless it hears it at an early age"
    --1 is a kind of animal communication
  2. birdcall - a device for imitating a birdcall
    --2 is a kind of
    acoustic device
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