Odransko Polje and Turopolje comprise a diverse lowland landscape shaped by centuries of traditional economic activities, interconnected ecosystems of floodplain lowland oak forests, pastures and meadows, the Oder river and stagnant waters. The conservation of the ecosystem has provided favorable habitat for many endangered and severely protected bird species. The Sisak-Moslavina County is characterized by floodplains along lowland rivers, which, due to their preserved habitats of high biodiversity, are protected areas and provide ideal conditions for the life and reproduction of wetland birds, but are also important in the role of transit areas during the spring and autumn migrations of birds. Wetlands are the most endangered habitats, and the reasons for the threat are drainage and land conversion, making wetland birds the most vulnerable group of birds due to habitat loss.
Wetland birds include different bird families and genera that are associated with water, wetlands, wet grasslands, and lowland, floodplain forests in their way of life.

Their body structures are adapted for movement, feeding and reproduction in wetlands. In this group we can find very large birds such as storks, swans or herons, but also small birds such as mourners or mites. In addition to size, many other adjustments such as the shape of a beak or body are the result of adapting to living in a natural environment.

The Sunje field is an area of the NATURA 2000 ecological network of exceptional and preserved flood forests of pedunculate oaks, ash floods, nitrophilic pastures and meadows, rich vegetation ponds, which contain many strictly protected bird species, as well as other animals and plants.
The Lower Posavina area of NATURA 2000, important for the protection of birds, encompasses a mosaic, lowland landscape along the Sava River, where birds find favorable living and breeding conditions.
Predators belong to the order of birds at the top of the food chain and have always aroused special interest and admiration for humans. According to their name, these birds grab their food, that is, capture their prey with their sharp claws. They have exceptional flying skills, and by their body structure, wing shape, tail and flight mode, they can be easily recognized from afar. They have a smaller number of pups, and their numbers are affected by all the negative, environmental impacts, and are the most endangered species of birds beside wetlands.

Zrinska gora (616 m above sea level) is a typical example of a massive highland of branched relief that belongs to the zone of inland Dinarides. The forested slopes of Zrinska gora, whose valleys are murmured by Petrinjčica, Sunja, Žirovac, Maja, Stupnica and others, are, because of the exceptional values of preserved flora and fauna, part of the ecological network. The conservation objectives of Zrinska Gora are the habitat types of beech, oak oak, soft chestnut and alder forests along mountain streams and strictly protected species of the wolf Canis lupus, yellow torturer Bombina variegata and vertebrae mountain stream Cordulegaster heros.
Large carnivores are an important component of biodiversity, and the existence of their populations is an indicator of the high quality and conservation of the habitat. Wolves attack mainly weaker, unhealthy animals and smaller mammals, thus affecting natural selection. In areas where extensive livestock farming has developed, wolf targets poorly guarded livestock and therefore can do more damage there.

The gray wolf Canis lupus is the largest member of the dog family. It is a territorial species and lives in herds, with strong hierarchical and social structures.
In the area of Sisak-Moslavina County there are 2-3 border herds that also use the territory of Bosnia and Herzegovina. The status of a protected species, large areas without major human activities, as well as an increased number of neglected agricultural areas allow an increase in the number of wolves in these areas.The public institution ZAŠTITA PRIRODE SMŽ conducts wolf tracking with photo traps.

The significant landscape of Kotar - Stari gaj comprises a large mostly forested area of ​​5,218 ha on which the forest stands of lowland oak forests alternate with the mountain forest stands of sessile oak, gentle chestnut, hornbeam and beech. Of particular interest is the southern and western edge of rural settlements with mosaic areas of meadows, old vineyards and orchards. Due to the location of the area between Sisak and Petrinja, most of the protected area was mined and suspected during the Homeland War and demining activities were carried out. Numerous species of strictly protected species of mammals, amphibians, insects and reptiles have been recorded in the area of ​​significant landscape, and we particularly emphasize the abundance of forest ornithofauna, of which we especially highlight the strictly protected species of woodpeckers.
Due to their lifestyle and nutrition, forest birds are an excellent indicator of the biodiversity of forest communities.

Piciformes mostly nest in older living trees, point-infected rot-causing organisms, and in dead standing trees. Woodpeckers do not damage economically valuable parts of trees. Woodpeckers are extremely important for the survival of a large number of other species of birds, mammals (especially bats) and other animals and even insects. Therefore, woodpeckers are considered to be key species in the ecosystem, ie species that do not have to be the most numerous but have a disproportionate impact on the structure and functioning of the ecosystem.

The area around Hrvatska Kostajnica encompasses the Zrinska gora along the Una River, a mosaic landscape of oak and chestnut oak forests, pastures and meadows with smaller rural settlements located in the lower parts. In the area of Sisak-Moslavina County, there are larger stands of preserved chestnut forests, which are particularly interesting to beekeepers who produce highly prized chestnut honey.

Chestnut (Castanea sativa) is a monoecious plant, with separate male and female flowers in the same tree. The chestnut tree is related to beech and oak, is durable and can grow up to 25 m high, and often over 500 years old. Botanists include chestnut in fruit trees, but because of the way and place of growth it is also a forest tree. The mosaic landscape of old orchards and forests with numerous stream valleys is a favorable habitat for bats.

Bats are a very important group of mammals that, with more than 1,300 species, make up about a quarter of the total number of mammals in the world. Most bat species are found in the tropical and subtropical zones, while the number of species decreases closer to North Pole and South Pole. An important part of the world's ecosystems and often an indicator of environmental health, but unfortunately they are also one of the most persecuted and least studied groups of animals.
In the temperate zone, as well as in Croatia, bats feed exclusively on insects and spiders. All our ecosystems are inhabited with bats, and the larger the number of species present in an area, one can say that its "health index" is higher. and some, depending on the annual cycle, use a whole range of different shelters, feeding in forests, above meadows, grasslands and pastures, above water, around lamps, depending on the preferences of each species. Bats threaten the loss of shelter and loss of hunting habitat. They live extremely long, have only one young per year, and the infant mortality rate is more than 50%, which is why populations of some species are very difficult to recover. As many as a quarter of the total number of bats species are in a particular threat category according to the International Union for Conservation of Nature (IUCN).

The Moslavačka Gora Regional Park represents a recognizable landscape unit of the wider area of ​​Sisak-Moslavina and Bjelovar-Bilogora counties, totaling 15,107.61 ha (Sisak-Moslavina County 8,197.93 ha, Bjelovar-Bilogora 6,909.68 ha). The forested area is mosaically tilled with agricultural land and intersected by picturesque stream valleys, while rural settlements plunge into forested areas. Vineyards and orchards have been planted on the southern slopes of Moslavačka Gora. Skrlet is one of the few grape varieties in continental Croatia that can be said to be indigenous, and is continuously grown in these areas. The basic natural phenomenon of the regional park are the preserved forest stands of the Central European floral composition (oak sessile, common beech, common hornbeam), southern European (tame chestnut) and a small part of Eurasian (alder, birch, pine), making a stable ecosystem of the associated plant and animal species.

Moslavina Gora has very interesting geological features and rich geological heritage. The characteristic occurrence of various magmatic and metamorphic rocks in interesting structural relationships.
The geology and paleontology of the Moslavačka Mountains is a particularly important segment of conservation and protection, and an overview of the geological richness can be seen in the natural oil deposits of the "pisco", fossils on the rocky banks of the stream, or in gravel deposits, stone migmatite balls, quartz sand deposits, numerous quarries, forgotten quarries, coal mines. In Gornja Jelenska, bentonite clay mines in 1994 discovered Macrouridae fossils from the Lower Miocene period (17-18 million years ago) and represent the most important site in Europe. According to the fragments found - short tusks, teeth, parts of the spine, the species of the dinoterium Prodeinotherium bavaricum and the Gomphoterium angustidens were determined. These elephants the size of an African elephant lived in a swampy, lowland area, and their tusks served to expose land and sludge in search of food. Along with fragments of praslon fossils, tooth fossils belonging to the Lower Miocene rhinoceros Brachypotherium brachypus were found.

The area of ​​the NATURA 2000 ecological network comprises the upper course of the Petrinjčica River, which springs on Zrinska gora at 560 m above sea level with numerous tributaries of smaller, mountain streams. The torrential character causes the formation of a specific, cut-off riverbed of a mountain river with numerous deposits of forest material. In the upper course of the Petrinjčica coast there are forested areas and in the lower part there are agricultural meadows, pastures and arable land. Along the shores of Petrinjčica, forest stands of alder and willow are often represented. 20 species of fish are characteristic of mountain rivers and many of them are protected. Fish are extremely important in maintaining the connectivity of different groups of fauna. Conservation of aquatic ecosystems is of paramount importance due to numerous pressures on the use of drinking water, sanitation, technological needs, irrigation, electricity generation or recreational needs.

Of the 55,000 known living vertebrate taxa, fish account for more than 28,000 species, and about 40% of species are freshwater fish. Fish are the best indicator of the status of aquatic ecosystems and an indispensable link in aquatic ecosystems nutrition networks and links to the terrestrial ecosystem. Fish vulnerability is related to habitat degradation, changes in watercourse velocity, partitioning, removal of river sediment, or introduction of allochthonous fish species.