There are two combining factors: on the one hand, the environmental pattern of La Hoya de Huesca offers perfect natural opportunities for birds to make their habitats and, on the other, the protected reserves, such as the ZEPAs (protected areas for birds), six in all. This region is therefore nationally and internationally famous for BIRDWATCHING.
Some of the largest groups of rock birds in the whole of Europe inhabit the limestone gorges of La Hoya. Amongst these there are many birds of prey - the carnivorous variety - recognizable by their curved beak and strong gripping claws.
The most numerous are the Griffon vultures and the bearded vulture, threatened with extinction (incidentally, the only bird on the planet that eats bones). It is here, in one of the few European redoubts, that this bird still exists.
The Guara Sierra and what is known as the Syncline Kingdom are authentic paradises for observing rock birds of prey: the Egyptian vulture (boleta in Aragonese), Griffon vultures, eagles, the bearded vulture already referred to, and other species.
In the sky over the rock formations and gorges in the region you can make out the typical silhouettes of each one of these big birds of prey as they glide with expertise on the air currents.At different points in La Hoya, open air or covered areas have been equipped as excellent observatories to study and enjoy watching these birds. These are in Riglos and in Santa Cilia de Panzano.
ACCESO: La parte meridional de La Hoya de Huesca también cuenta con una ZEPA, en el entorno de las localidades de Piracés y Tramaced, por la carretera A-131 con desvío en Sesa y entre Novales y Albero Alto.
Águila Real
Alimoche
Halcón Peregrino
Búho Real 
Chova Piquiroja 
ACCES: You can reach the top part of the ridged cliffs by car on the road between Sabayés and Santa Eulalia de la Peña. You will find information about the San Miguel and Amán Crags in the parking area.
The bottom part of the synclines can be reached on foot from San Julián de Banzo.
Griffon Vulture
ACCESS: From San Julián de Banzo there is a path, about 5 hours on foot return journey, which goes up the gorge. From the San Salvador pass you should be able to sight a lot of eagles.
Griffon Vulture Peregrine Falcon Eurasian Eagle-Owl Red-Billed Chough
ACCES: The region, comprising the synclines and the Vadiello dam, is traversed by different sign-boarded paths that leave from the dam and from the dam wall.
Golden EagleGriffon VultureEgyptian Vulture
Bearded VulturePeregrine FalconEurasian Eagle OwlRed Billed Chough
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