Ag-Gol, situated in the Mil plain of the Kur-Araz lowlands has a semi-desert landscape and is an important overwintering and nesting place for birds. Over 140 species of birds are found in the park, including 89 species of nesting birds (partridge, spoonbill, swan, teal, bustard, etc.). Approximately 30 specimens of charadriiformes and 24 specimens of anseriformers have chosen this reserve home for themselves. Some of the bird species living here such as Francolinus, white-tailed eagle, white pelicans (Pelicanus onocrotalus) and Dalmatin pelicans (Pelicanus crispus) are added to the "Red Book".
In addition to birds, the reserve is rich with 20 fish species such as pike, erythroculter, mongolicus and carp. However, it was much richer for its fish species in the past as it was connected with the River Kura. Furthermore, there are green toad, hylidae and lake trod in the reserve. Besides, it is possible to see the Caspian and swamp turtles, common and water grass snakes in the reserve.
Moreover, 22 species of mammals such as wild boar, coypu and jungle cat (Felis chaus) occur in the reserve.[2]
The park is designed to protect the marshy ecological system, as the nesting and wintering places of migratory and water birds. Ag-Gol has been incorporated into the list of UNESCO's convention "On internationally important marshy areas as the residing places of birds"
