The characteristics of the climate, the abundant vegetation and the existence of numerous courses of water that it presents the province of Entre Ríos, they contribute to the existence of a very rich and varied wild fauna.
In the center of the province very characteristic animals exist, vizcachas, martinetas, mules, foxes, blue, tucu-tucus, turtles of varied types, hares, partridges and gallaretas are some of the most outstanding.
Already in the areas, this and west of Entre Ríos, carpinchos, otters, and river wolves cohabit. The cardinals, goldfinches and parrots are among the birds, ducks, gallaretas, blue and pirinchos. The fish that more they are plentiful they are:
- Sábalo (Ptochilodus platensis): It has abundant rather fat meat.
- Palometa Amarilla (Serrasalmus aureus): It is similar to the piranha .
- Manduvá (Ageneiosus brevifilis): It is similar to the manduví.
- Taratira (Hoplias malabaricus): It is a carnivorous fish that can end up weighing 5 kilograms. During the winter it is buried in the mud.
- Manguruyú (Paulicea luetkeni): It can end up measuring 2 meters and weighing 100 kilograms.
- "Surubí atigrado" (Pseudoplatystoma fasciatum): It can weigh about 100 kilograms.
- "Surubí Manchado" (Pseudoplatystoma coruscans): It is similar to the surubí atigrado. - Patí (Luciopimelodus pati): similar to the "bagre" though without thorns in the fins, it is caught in spring.
- Dorado(Salminus maxillosus): The biggest ones can be found in Paraná River, they can end up measuring a meter and weighing 20 kilograms.
- Pacú (Colossoma mitrei): It ends up measuring up to 15 kilograms.
Among the reptiles and turtles, we can mention: yacarés, frogs, toads, small lizards, green lizards, etc.
The most common snakes' species are: the gray Yarará or urutú, it inhabits along the coast, the Mesopotamia and the center of the country. It is very poisonous, it can measure about 1 meter length, the "de la Cruz" snake ends up measuring up to two meters length. The false yarará or "yarará ñata" can be found along the whole country. The "Coral" snake, which poison is very powerful, isn't aggressive and its eye teeth size doesn't allow it to attack men easily. It reaches about a meter length and it is black and it has red and yellow rings. The false coral snakes are very similar but completely inoffensive. The Mussurana, eats the yararás.
It is a very well known bird among country people. It builds its nest, similar to the Creole oven, with two rooms, using mud and branches, the nest is placed on top of the trees or posts. It always locates the entrance facing to the northern warm winds, protecting it from the cold, humid, "Pampero". They are monogamous and have stable couples.
The legend tells that the bird was once a brave hunter who lived in a remote place, alone with its father. He fell in love with a young girl who was a singer, whom he met traveling, but when he became a youth he had to undergo the manliness test, that was compelling in his tribe. The winner would obtain the cacique's daughter as a prize. He had to win two races, one on foot and the other swimming. Later on he had to carry out a test consisting of being quiet in a leather sack without eating, he could only drink liquids during 9 days. Tradition tells that the brave hunter was successful in all the tests, but they took a long time in taking him out of the leather sack. When they made it, they realized that he was becoming a small bird. When he was free, he flew towards a "lapacho" and he sang his first melodious song, giving up the cacique's daughter. With the passing of time that the girl also became a bird and she flew towards him.