* Bats: There are 20 species of bats in Romania, including the greater mouse-eared bat, the common pipistrelle, and the Daubenton's bat.
* Bears: Romania is home to the largest population of brown bears in Europe, with an estimated 6,000-7,000 individuals. Other bear species found in the country include the Eurasian lynx and the Carpathian wolf.
* Boars: Wild boar are found throughout Romania and are a popular game species.
* Deer: Red deer, roe deer, and fallow deer are all common in Romania.
* Foxes: Red foxes and Arctic foxes are both found in Romania.
* Hares: European hares and mountain hares are both common in Romania.
* Hedgehogs: There are two species of hedgehogs in Romania, the European hedgehog and the northern white-breasted hedgehog.
* Marmots: Alpine marmots and Carpathian marmots are both found in Romania.
* Mooses: Moose are found in the northern and eastern parts of Romania.
* Rabbits: European rabbits and mountain rabbits are both common in Romania.
* Raccoons: Raccoons are an invasive species in Romania and have been found in the western and southern parts of the country.
* Squirrels: Red squirrels and Eurasian red squirrels are both common in Romania.
* Weasels: Least weasels, stoats, and polecats are all found in Romania.
* Wolves: Carpathian wolves are the largest wolves in Europe and are found in the Carpathian Mountains.
Birds
* Birds of prey: Golden eagles, white-tailed eagles, lesser spotted eagles, and peregrine falcons are all common in Romania.
* Corvids: Magpies, jays, and crows are all common in Romania.
* Finches: Goldfinches, linnets, and siskins are all common in Romania.
* Larks: Skylarks, woodlarks, and meadowlarks are all common in Romania.
* Owls: Barn owls, tawny owls, and long-eared owls are all common in Romania.
* Passerines: Sparrows, finches, and buntings are all common in Romania.
* Pheasants: Common pheasants and ring-necked pheasants are both common in Romania.
* Pigeons: Wood pigeons and stock doves are both common in Romania.
* Thrushes: Mistle thrush, song thrush, and redwing are all common in Romania.
* Tits: Great tits, blue tits, and coal tits are all common in Romania.
* Woodpeckers: Great spotted woodpeckers, lesser spotted woodpeckers, and green woodpeckers are all common in Romania.
Reptiles
* Lizards: Common lizards, sand lizards, and green lizards are all common in Romania.
* Snakes: Grass snakes, dice snakes, and vipers are all common in Romania.
* Turtles: European pond turtles and Hermann's tortoises are both common in Romania.
Amphibians
* Frogs: Common frogs, green frogs, and marsh frogs are all common in Romania.
* Newts: Smooth newts, palmate newts, and alpine newts are all common in Romania.
* Salamanders: Fire salamanders, alpine salamanders, and Carpathian salamanders are all common in Romania.
Fish
* Carps: Common carp, crucian carp, and tench are all common in Romania.
* Catfish: European catfish, wels catfish, and burbot are all common in Romania.
* Eels: European eels are found in the rivers and lakes of Romania.
* Perch: European perch, zander, and pike are all common in Romania.
* Salmon: Brown trout, rainbow trout, and Atlantic salmon are all found in the rivers and lakes of Romania.
* Sturgeon: The Danube sturgeon is a rare and endangered fish found in the Danube River.
Invertebrates
* Bees: There are over 1,000 species of bees in Romania, including the honeybee, the mason bee, and the bumblebee.
* Butterflies: There are over 2,000 species of butterflies in Romania, including the swallowtail, the monarch, and the red admiral.
* Dragonflies: There are over 100 species of dragonflies in Romania, including the common hawker, the southern hawker, and the golden-ringed dragonfly.
* Grasshoppers: There are over 700 species of grasshoppers in Romania, including the common grasshopper, the meadow grasshopper, and the bush grasshopper.
* Spiders: There are over 1,000 species of spiders in Romania, including the common house spider, the garden spider, and the wolf spider.