At the Bieri wildlife center, in the Municipality of Pieve Fosciana (province of Lucca) pair training operations are underway for the 2021 breeding season (Life Perdix Project). The phenotypic choice of individuals reflects the characteristics described by Hartert in 1917 and included by ISPRA (Higher Institute for Environmental Protection and Research) in its 2016 Action Plan: gray partridge its plumage is characterized by a more dark and less rusty and reddish color.
It can be seen in the photo accompanying this article a male with the horseshoe on the chest very evident and the detail of a feather that brings out the dark shade well.