• Mammals - Bats are the most abundant mammal species in the region and find refuge in caves feeding on insects that thrive year round. Small mammal species are abundant, although studying them is difficult. Most species have been identified by regurgitated bones in roosts of nocturnal birds of prey.
  Large mammals are rare.

• Birds - The region is especially significant for birds. The number of species recorded is an impressive 267. Most of these are migratory waterfowl and aquatic bird species, and the Divari Lagoon plays a vital role in their survival. Herons (7 species), glossy ibis, over 30 species of waterfowl, and dozens of other migratory birds rely on Divari Lagoon as their spring oasis.
  In autumn, the lagoon is their last pit stop before their flight. The birds feed and rest here, gathering strength for their journey.

• Fish - Striped mullet and sea bass are the most common fish species in the lagoon. Eels were abundant until the salt level of the water rose.
  A small fish (up to seven centimetres long) inhabits the shallow protected waters that are high in salinity -- the tooth card is a resilient fish that can survive in extremes of salinity and temperature.

• Amphibians and reptiles - This part of the Peloponnese is rich in reptiles, and 30 have been recorded in the region – snakes, lizards, worms, tortoises, and a unique chameleonspecies. The region has other important reptile species. One is the limbless skink, a lizard with no legs that is well hidden.
  Loggerhead sea turtles lay eggs (up to 30 nests) along Romanou Beach. The region’s amphibian species are five (three frog and two toad species) that are often heard croaking.