Is it a bird, is it a frog or a bush cricket? On an enigmatic nocturnal calling song recorded at different locations in southern Bahia, Brazil (Orthoptera, Tettigoniidae, Paracycloptera grandifolia )

After more than ten years of fieldworks in southern Bahia registering an enigmatic vocalization we were finally able to identify the source of it. The calls were emitted by Paracycloptera grandifolia , a katydid belonging to the Tettigoniidae. Its call lasts between 0.5 - 1.3 seconds and consists of 7 - 8 groups of pulses. The dominant frequency lies at 3 kHz.