Species of interest
• The sedentary most outstanding species ( Species of Tourist Interest ) are the purple gallinule ( Porphyrio porphyrio ), with some 10 couples in the Odiel lagoon, Portil and Ayamonte-Isla Cristina and the white-headed duck ( Oxyura leucocephala ), with reinforcement of winter visitors.

• Summer breeding birds are the squacco heron ( Ardeola ralloides ), collared pranticole, in the order of 20 couples in Odiel and other 20 in Ayamonte-Isla Cristina), bee-eater ( Merops apiaster ) and the spoonbill, with some 200 breeding in the Odiel lagoon and a fluctuating population of winter visitors non breeders in the Odiel lagoon, Ayamonte-Isla Cristina and Piedras river.

• During the winter new species appear and is when the maximum figures of species are reached. Among the exclusively wintering ones we must mention the greater flamingo with about 1.700 individuals in the Odiel lagoon in 2004 and 2005 and about 300 in Ayamonte-Isla Cristina), marbled teal ( Marmaronetta angustirostris ), Audouin's gull ( Larus Audouinii ), with around 150 individuals in the Odiel lagoon, and other 10 individuals in the swamp of the Piedras river, pintall, with 200 individuals wintering in the Odiel lagoon, 25 in Ayamonte-Isla Cristina, and other 10 in the Portil lagoon. With interest restricted to the not specialized public it can be mention osprey that winter here.

Time of the year
• The whole year is appropriate. The kindliness of the climate allows an interesting phenology, hence the many kind of situations: sedentary breeding species and summery breeding visitors, birds that exclusively pass the winter here as the marbled teal or the Audouin's gull; that winter and coexist with another population that raise here and emigrate to África like the white stork ( Ciconia ciconia ), the spoonbill and the shelduck ( Tadorna tadorna ); or that are sedentary as the red –crested duck ( Netta rufina ), the white-heade duck, the real kite or the avocet; and lastly, birds in migrating or wandering (Spanish imperial eagle, lesser kestrel).

• The biggest diversity of species and concentrations of individuals take place in winter time, although many of those species come from the countries of the potential tourists' originated, for this reason they may prefer the summery visitors, to know breeding species of more southern distribution.

Observation places
• The most appropriate places for the visit are the Odiel laggon, those of Ayamonte.Isla Cristina and la Flecha del Rompido, the lagoon of Portil or the marshlands of the Piedras river. In each site the visits can be done through the dune system that separates of the sea, with possibility of observe marine birds, and another for the interior of the marshland. In some cases it can be carried out a third trip through the forest masses or of heath that are associated. In principle, to not perturbing the breeding sites, during reproductive period it can be preferable to only make observations from paths and hides and to limit the use of boat during wintering.

• The most spectacular moments can be during the nuptial displays when this special behaviour can be observed, is the case of the great crested grebe ( Podiceps cristatus ). Also is a period in which the birds in general diminish the cautions and is easier to detect them, and they are more active during the mid hours of the day than in the rest of the year. During the breeding, the feeding of the chicks imposes frequent trips of the adults. When concluding the reproductive period, before the dispersion of the juvenile, another specially interesting moment for the possibility of comparing adults' plumage and juvenile. In reproductive period it will be necessary to avoid the areas in those that most sensitive species nest and to take cautions to avoid nuisances.

The forest and heaths birds interest, although of second order that reside in the specific numerous representation that we can observe in the area.

Species of interest
• As forest Species of Tourist Interest or of heaths, one can expect to observe the buzzard, the goshawk ( Accipiter gentilis ), the sparrowhawk, the thekla lark, the Rufous bush robin, the green woodpecker, the golden oriole ( Oriolus oriolus ), the black-eared wheatear (only in summer) and only during the winter, the crane.

Time of the year
• The visit has attractiveness in any time of the year. During the winter it highlights the presence of the crane.

Observation sites
• Pine groves of the Campo Común de Arriba and holm oaks Wood of the embalse de Sancho for the forest birds. Meadows of the reservoir of the Piedras river and grassland mosaic and heath of the north end of the district in Cartaya for the birds of more open spaces.