Birds, due to their ease of observation, behave as an excellent bioindicator of the processes of changes in land uses, in addition to the increasing attention received by the possible decreases in populations of terrestrial birds - mainly passerines and similar groups - makes immediate development necessary. of methodologies and specific programs for the monitoring of their populations in this type of anthropized environments.
Active quarries can act as an effective resource to check the behavior of birds and more particularly the absorption capacity of reproductive elements in areas of influence of these Mining Centers.
Mining operations are divided into numerous heterogeneous spaces, exploitation fronts, roads, naturalized areas, internal forests, etc., also in the north of the peninsula, the meteorological conditions allow the growth of different tree species, which can be used as reproductive niches for a good number of forest passerine species. The purpose of this project is to verify the reproductive capacity of birds that the different ecological plots that make up the Arrigorriaga quarry may have, and how the birds respond to the contribution of artificial niches.