Busard cendré
The Aragon Steppes are cited as the largest habitat for bird communities in Spain. Highly endangered are great and little bustards, Eurasian stone-curlew, lesser kestrel, Montagu's harrier and Dupont's lark, as these species are directly threatened by changes in the steppe ecosystem. The endemic plant species, 45% of all plant species in Spain, are also under decline. A project supported by BirdLife International at the "Muelas del Jiloca" Special Protection Area has been launched to conserve the birds and plants.