Teams will also employ different skills such as hearing the owls or nightjar churring during mid-night to record bird species .
他们也会在赛事中运用不同技术,如在深宵聆听猫头鹰和欧夜鹰的鸣叫声等来寻找鸟类。
The sweet birdsong of the nightjar , the roar of a lion or the grunt of a hippo could soon replace the trilling and beeping of britain 's mobile phones .