018016a.mp3   8.2 s206 KB Birds and frogs
  018016b.mp3   14.2 s353 KB Birds and frogs
  018016c.mp3   10.5 s248 KB Birds and frogs
  018017a.mp3   6.0 s147 KB Night birds
  018017b.mp3   19.1 s498 KB Night birds
  018018a.mp3   18.5 s553 KB River Warbler (Locustella fluviatilis)
  018019a.mp3   11.5 s379 KB River Warbler (Locustella fluviatilis)
  018019b.mp3   4.3 s143 KB River Warbler (Locustella fluviatilis)
  018020a.mp3   9.7 s257 KB Grass frogs (Rana sp.)
  018020b.mp3   2.6 s58 KB Grass frogs (Rana sp.)
  018021a.mp3   49.8 s1185 KB Grass frogs (Rana sp.)
  018021b.mp3   100.4 s2440 KB Grass frogs (Rana sp.)
  018022a.mp3   2.8 s82 KB Night bird
  018522a.mp3   15.6 s250 KB House sparrow (Passer domesticus)
  018522b.mp3   2.0 s33 KB Cock
  018522c.mp3   17.4 s278 KB House sparrow (Passer domesticus)
 Sounds - natural 
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