The fact that this stretch of coast Ponteceso is included in an SPA (Special Protection Area for Birds) gives us an idea of the ornithological importance of Ponteceso coast. Undoubtedly, its highlighted all Anllóns estuary where we can find a variety of species, particularly waterfowl and sea birds which flock here in the winter months and during the migratory time.
The number of birds recorded in the estuary of Anllóns amounts to 289 being by chance, the place of Galicia with the higher figure.
Another remarkable aspect of the River Anllóns estuary is that because of its geographical proximity and due to winds from the Atlantic Ocean, this is one of the best places in Europe, after the British Isles and the central islands of the North Atlantic for the North American birding. There have been accounted for up to 26 species of this continent located in the area.
As an example, we should mention that this is the only appointment in the Iberian Peninsula that have the Great Crested Grebe (Podiceps grisegena holboellii), Golden Plover Guy or Golden Plover (Pluvialis dominica), the American Wigeon (Anas americana), the Teal (Anas carolinensis), Tufted or Ball (Aythya affinis), etc.
Interestingly, not only North American species are vagrants, but also North African species as the Runner (Cursorius cursor) or Desert Wheatear (Oenanthe deserti).