Black grouse  (Tetrao tetrix)

Lek mating system: system of mating in which males display collectively in an area known as a lek. Males compete for the best sites within the lek and females then choose whom to mate with on the basis of the display.

1. UNEP-WCMC (November 2001)
   http://quin.unep-wcmc.org
   
2. Peterson, R.T., Mountfort, G., Hollom. (1993) Collins Field Guide. Birds of Britain and Europe. Harper Collins, London.
   
3. UK Biodiversity (November 2001)
   http://www.ukbap.org.uk
   
4. 4) Greenoak, F. (1997) British birds, their folklore, names and literature. Christopher Helm A&C Black, London.
   
5. Game Conservancy Trust (November 2001)
   http://www.gct.org.uk
   
6. RSPB (November 2001)
   http://www.rspb.org.uk
   
7. Battern, L. A., Bibby, C. J., Clement, P., Elliott, G. D. and Porter, R.F. (1990) Red Data Birds in Britain. T & A.D. Poyser, London.