Conservation index to determine a single conservation value of the vertebrates of all UTM squares 1x1 km from the scope of the SITxell project. The following groups of terrestrial vertebrates have been considered: mammals, amphibians, reptiles and birds (wintering and nesting). The methodology followed was: Union of information from nesting and wintering birds considering the maximum conservation value of each of the species in each of the squares. The ICONS values ??of each species and square, both birds and mammals, amphibians and reptiles, have been calculated, raising the conservation value to the fourth power, the maximum power used in the separate maps (that of birds ). Finally, the ICONST value was calculated: the ICONS value corresponding to each bird species was added to each square according to its phenology and the ICONS values ??of each species present in amphibians, reptiles and mammals. Values ??from 0 to 100 have been weighted and represented on the 1x1 UTM grid for the entire SITXELL area.