SUBSCRIBE to the OFFICIAL BBC YouTube channel 👉 https://bit.ly/2IXqEIn
GET ALL your fresh TV and sofa-hugging box sets on BBC iPlayer 👉 https://bbc.in/2J18jYJ

Programme website: http://bbc.in/1GBs2no By popping their brightly coloured air-sacs male sage grouse create a sound that can carry three km to attract females to their display ground.

#bbc