Now after I play back these humpback calls, I'll play blue whale calls, but they have to be sped up because they're so low in frequency that you wouldn't be able to hear it otherwise.
ザトウクジラの鳴き声の次に シロナガスクジラの鳴き声を再生します　少し早回ししています かなり低周波の音なので 早回ししなければ聞こえません