Cwm-Yr-Eglwys valley singers this morning included grasshopper warbler (1), willow warbler (4), chiffchaff (4-5), blackcap (1). And a tawny owl. The spectrogram shows the grasshopper warbler as a broken-up, horizontal band at around 6.5 kHz, and five verses from a willow warbler descending from around 6 kHz to 2.5 kHz.
