Does stocking with redleg partridges cause the wild grey partridge to decline?

There is no hard research evidence of this, but redlegs may be detrimental in some circumstances.

Generally, the grey partridge is a more aggressive bird, but in the spring redlegs may dump their eggs into grey nests, resulting in incomplete or disrupted incubation of the grey eggs.

Unless special measures are taken to avoid it, greys can be shot by mistake, especially on redleg days, but also by inexperienced guns on pheasant days.