He suggested that females may perceive the song as abnormal if they could not hear the lower frequencies and, over a period of time, this could have a potential impact on the abundance of the species as if adults were not pairing and mating then the number of offspring would decrease as a result.

BBC: Traffic noise driving songbirds to the limit in cities

Despite losing the set, the Poles continued to look the stronger pairing and Murray had to save a break point early in the third set before the world number three was broken in the sixth game.

BBC: GB suffer Davis Cup doubles loss