Red-legged partridge

Larger than the grey partridge, it has a large white chin and throat patch, bordered with black. It has a greyish body with bold black flank stripes, and a chestnut-sided tail. It is an introduced species, brought to the UK from continental Europe, where it is largely found in France and Spain.

http://www.rspb.org.uk/wildlife/birdguide/name/r/redleggedpartridge/