The Eurasian Eagle-Owl is a large nocturnal raptor, one of the most imposing owls in the world. It measures between 60 and 70 cm in length, with a wingspan of 1.6 to 1.8 meters, and weighs between 1.5 and 4.5 kg. Its plumage is primarily brown, with white and black mottled patterns, and its eyes are bright orange, giving the bird a piercing gaze. It also has tufts of feathers on its head that resemble ears, which give it a distinctive appearance. The Eurasian Eagle-Owl primarily inhabits forests, mountains, and rocky areas in Europe, Western Asia, and the Middle East. It is an opportunistic hunter, feeding mainly on small mammals, birds, and sometimes reptiles or amphibians. The Eurasian Eagle-Owl is a solitary and territorial bird, known for its powerful and deep calls, often heard at night. While the species is not endangered, it may be affected by the destruction of its natural habitat and human disturbances.

The Eared Grebe is a small grebe measuring between 28 and 35 cm in length with a wingspan of 57 to 59 cm. In breeding plumage, it has a black head adorned with golden feathers forming a crest, a black neck, a black chest, and chestnut flanks. In non-breeding plumage, it is more subdued, with a black back, black cap, white cheeks, and a white belly. It frequents shallow lakes and ponds, rich in aquatic vegetation, where it primarily feeds on small fish and aquatic invertebrates. Reproduction occurs in summer, with a clutch of 3 to 6 eggs laid in a floating nest. The young are capable of swimming shortly after hatching and can be carried on the parents' backs. A migratory species, it winters in the Mediterranean and warmer regions. Listed as Least Concern by the IUCN.

The Common Frog is a widespread species of frog in Europe, easily recognized by its brown or green skin, often spotted with dark markings. It primarily lives in wetland areas such as marshes, ponds, and riverbanks. This frog is an opportunist, feeding mainly on insects, worms, and small invertebrates that it captures with its quick tongue. The Common Frog is often seen during its movements toward water for breeding, a characteristic behavior in spring. It is active during the day and evening, although its habits are more pronounced during the breeding season.

The European Bee-eater is a small, colorful bird, easily recognizable by its vibrant plumage, which features a combination of bright colors, mainly blue, green, yellow, and orange. It measures about 28 to 30 cm in length, with a wingspan of 40 to 45 cm, and weighs between 30 and 40 g. Its beak is long and pointed, perfectly adapted to catching insects in flight, primarily wasps, bees, and other flying insects. The European Bee-eater primarily inhabits open areas, grasslands, forest edges, and steppes in Europe, as well as North Africa and Western Asia. It is migratory and mostly travels to sub-Saharan Africa for the winter. This small bird lives in colonies, and its nests are often dug into cliffs or riverbanks. The European Bee-eater is known for its swift flights and acrobatic behavior while capturing its prey. Although the species is not endangered, it may be threatened by habitat loss and human disturbances, such as the degradation of natural habitats.

The Ethiopian Swallow is a small, graceful bird, identifiable by its metallic blue back and white underparts. It has a forked tail typical of swallows. This species is mainly found in sub-Saharan Africa, frequenting open areas, villages, and towns. It is often seen in flight, hunting insects for food. The Ethiopian Swallow is a partial migrant, moving according to seasons and food availability. It builds a cup-shaped nest with mud, often under building eaves. Its population is stable, and it is not considered threatened.

The Eurasian Oystercatcher is a coastal bird easily recognizable by its black and white plumage and long orange beak. It measures about 40 to 45 cm in length, with a wingspan of 75 to 85 cm, and weighs between 300 and 400 g. Its beak is long and straight, ideal for digging up shellfish and other mollusks, which it primarily consumes, though it also feeds on worms and marine insects. The Eurasian Oystercatcher primarily inhabits the coasts of Europe, north-west Africa, and parts of Asia. It prefers beaches, estuaries, and mudflats where it can forage at low tide. This bird is very territorial and can be seen in small colonies during the breeding season, but typically lives alone or in small groups outside of that period. Although the species is not immediately endangered, it is sensitive to habitat loss, beach pollution, and human disturbance.

The Eastern Grey Kangaroo, or Macropus giganteus, is a prominent marsupial native to Australia, recognized for its large size and unique hopping locomotion. It has a grey-brown coat with a lighter belly. Males can reach up to 2 meters in height and weigh around 66 kg, while females are generally smaller. These kangaroos live in groups known as "mobs" and are primarily herbivorous, feeding on grasses and leaves. They possess powerful hind legs and a muscular tail used for balance. Although they are mostly active at dusk and dawn, they can also be seen during the day.

The European Rabbit is a small herbivorous mammal, widely distributed across Europe and in certain parts of the world where it has been introduced. It measures about 40 to 50 cm in length, with a short tail and soft fur that varies from light gray to brown, with a white belly. The European Rabbit is known for its long ears, bright eyes, and powerful hind legs that allow it to leap quickly. It typically lives in groups in burrows called "warrens," which it digs in soft soils or dense vegetation. This rabbit is primarily herbivorous, feeding on grasses, roots, leaves, and fruits. While it is an excellent breeder, with several litters a year, it is vulnerable to predators such as foxes, birds of prey, and carnivores. Despite its large population, the European Rabbit is threatened in some areas by excessive hunting, habitat loss, and the spread of diseases. It plays an important role in ecosystems as prey for many carnivores and as an ecological engineer, digging burrows that alter soil structure.

The Garden Dormouse is a small nocturnal rodent, often compared to a miniature squirrel, found primarily in Europe and Asia. It measures about 20 cm in length, with a tail of around 12 cm, and weighs between 100 and 150 g. Its coat is typically light gray or brown, with a dark line running from its eyes to its back and a lighter area on its belly. The Garden Dormouse is primarily nocturnal and arboreal, feeding on fruits, nuts, seeds, as well as small insects and larvae. It is an excellent climber and takes refuge in trees or crevices to sleep during the day. This rodent is a hibernator, retreating into its nest in the fall to survive the winter, which is essential for its survival in the cold. Although the Garden Dormouse is protected in some areas, it is threatened by deforestation and the reduction of its natural habitat.

The Erhard's wall lizard, or Podarcis erhardii, is a species of lizard found primarily in the Aegean islands and some regions of mainland Greece. This small reptile, typically measuring between 18 and 25 cm in total length, is known for its ability to adapt to various environments, ranging from rocky areas to open grasslands. Its coloration varies from brown to green, often with band or spot patterns, allowing it to blend effectively into its natural habitat. Active mainly during the day, the Erhard's wall lizard feeds on insects, spiders, and other small invertebrates. Although relatively common in its range, it is sensitive to habitat disturbances, particularly due to human development and tourism activities.

The European green lizard is a slender lacertid measuring 15–20 cm in body length, with a tail up to 1.5 times the body length. It has vivid green dorsal coloration and a yellowish-green belly. It inhabits sunny grasslands, woodland edges and rocky areas, feeding on insects and spiders. During the breeding season, males develop brighter colors and perform territorial displays on exposed rocks.

The European Hare is a large herbivorous mammal, easily recognizable by its long ears and powerful hind legs. It measures about 50 to 70 cm in length, with a short tail and a wingspan of 70 to 90 cm, and weighs between 3 and 5 kg. Its coat varies with the seasons: in winter, it becomes lighter, while in summer, it takes on a brown or gray hue, allowing it to blend effectively into fields and meadows. The European Hare is a solitary and territorial animal, primarily found in open areas such as fields, meadows, and sparse woodlands. It is particularly fast and agile, capable of running at speeds of over 60 km/h when pursued. This hare primarily feeds on grasses, leaves, fruits, and roots. Although the species is widespread in Europe, it faces threats from hunting, habitat loss, and human disturbances.

The Gray Dormouse is a small nocturnal rodent, closely related to the Common Dormouse, found mainly in Europe in forests, hedgerows, and gardens. It measures between 10 and 15 cm in length, with a tail of about 8 to 12 cm, and weighs between 40 and 100 g. Its coat is generally light gray or brown-gray, with lighter shades on the belly and dark eyes that give it a lively expression. The Gray Dormouse is an excellent climber and is primarily arboreal. It feeds on fruits, seeds, nuts, and sometimes insects and small worms. This rodent is known for its ability to hibernate during the winter, retreating into natural cavities or nests made of leaves and moss to survive the cold temperatures. While it is relatively common, it is threatened by habitat loss, deforestation, and disturbances caused by human activity.

The European Golden Oriole is a brightly colored bird, easily recognizable by its striking plumage. The male is particularly vivid yellow with black wings, while the female has a more subdued plumage, mainly olive green and yellow. It measures about 25 cm in length and weighs between 40 and 60 g. This migratory passerine bird primarily inhabits open forests, orchards, and hedgerows, mostly in Europe, and migrates to North Africa for the winter. The European Golden Oriole is known for its melodious and powerful song, consisting of clear and repetitive notes. Its diet is primarily insectivorous, feeding on caterpillars, wasps, and other insects, but it also consumes fruits such as berries. This bird is discreet and hard to observe as it spends most of its time high up in trees. While its population is stable in some regions, it is threatened by deforestation, the loss of its natural habitat, and the reduction of its food sources due to pesticide use.

The Eastern Wolf is a subspecies of the gray wolf, primarily found in the regions of Eastern Europe, notably in Poland, Romania, Bulgaria, and Ukraine. It measures about 1.2 to 1.5 meters in length, with a tail of 35 to 45 cm, and weighs between 25 and 45 kg, with males generally being larger and more massive than females. Its coat is thick and generally light gray to dark gray, with brown and white shades on the belly and legs. The Eastern Wolf primarily inhabits forests, mountains, and protected areas, where it hunts prey such as deer, wild boars, roe deer, and sometimes small mammals. It is a social predator, living in packs, and cooperates with other members of its group to capture prey. Although this subspecies has been the subject of conservation programs, it remains vulnerable to hunting, habitat loss, and conflicts with humans.

The Eurasian Otter is a semi-terrestrial aquatic mammal found primarily in rivers, lakes, and coastal areas of Eurasia. It measures between 60 and 90 cm in length, with a tail of about 30 to 40 cm, and weighs between 5 and 12 kg. Its coat is thick and waterproof, dark brown on the back and lighter on the belly, allowing it to stay warm and move easily in the water. The Eurasian Otter is an excellent swimmer, using its hind limbs to propel itself and its tail to stabilize. It primarily feeds on fish but can also hunt amphibians, crustaceans, and small mammals. It is a solitary animal or lives in small family groups, marking its territory with traces and droppings. Although the species is protected in many areas, it is threatened by water pollution, habitat loss, and poaching.

The emperor penguin is the largest penguin species, standing 1.1–1.3 m tall and weighing 22–45 kg, with striking black-and-white plumage, a pale yellow breast and orange patches at the bill’s base. Endemic to Antarctica, it breeds on sea ice during the austral winter, forming vast colonies to shelter from cold and marine predators. Following courtship displays in April–May, the female lays a single egg which she transfers to the male for incubation before returning to sea to feed.

The European Kingfisher is a small aquatic bird, easily recognized by its vivid plumage and bright colors. It measures about 17 to 19 cm in length and weighs between 30 and 40 g. Its back is a brilliant metallic blue, while its belly is a bright orange. Its bill is long, straight, and pointed, perfectly suited for catching fish and aquatic insects. This kingfisher primarily lives along rivers, lakes, and canals in Europe, where it perches on branches or rocks near the water. When hunting, it dives quickly in a headfirst plunge to capture its prey, often using its excellent vision to locate fish underwater. The European Kingfisher is a solitary bird, defending its territory by emitting a sharp call. While it is relatively common in many parts of Europe, it can be threatened by water pollution and habitat destruction.

The European blackbird is a very common passerine bird found throughout Europe, Asia Minor, and North Africa. It is easily recognized by its glossy black plumage and bright yellow beak. This passerine primarily feeds on earthworms, insects, and fruit. Although it is often seen in gardens and urban parks, it remains a relatively discreet bird. It is also highly regarded for its melodious song, especially in spring.

The Stone-curlew is a large, ground-dwelling bird primarily found in open and arid regions of Europe, the Middle East, and North Africa. It measures about 40 to 45 cm in height and weighs between 350 and 500 g. What distinguishes the Stone-curlew is its cryptic plumage, generally brown-gray in color, allowing it to blend effectively among vegetation or rocks. It has large yellow eyes and a distinctive call, which is often heard during the night, hence its name. This bird primarily feeds on insects, worms, and small invertebrates found on the ground. The Stone-curlew is mostly active at dusk and at night, feeding slowly while scanning its surroundings. While not in immediate danger, it faces threats from habitat loss, intensive agriculture, and human disturbance.

The Northern Pygmy Owl is a small nocturnal owl found primarily in North America, from southern Canada to Mexico. It measures about 20 to 25 cm in length, with a wingspan of 50 to 60 cm, and weighs between 70 and 100 g. Its plumage is mainly gray-brown, with spots and streaks that help it blend perfectly into foliage and tree trunks. The Northern Pygmy Owl primarily feeds on small mammals, insects, and reptiles that it hunts during the night. It is an excellent hunter, using its keen eyesight and sharp hearing to locate its prey in the darkness. While this species is not currently threatened, it can be affected by deforestation and the loss of its natural habitat.

The Three-toed Woodpecker is a small bird from the woodpecker family, primarily found in coniferous forests of Europe and Asia. It measures about 20 cm in length, with a wingspan of 40 to 45 cm, and weighs between 50 and 70 g. Its plumage is primarily black and white, with a distinctive yellow patch on the top of its head, and white streaks on its wings. What distinguishes the Three-toed Woodpecker is the presence of three toes on each foot, which allows it to climb with great agility. It primarily feeds on insect larvae, which it extracts from the bark of trees using its strong beak. The Three-toed Woodpecker lives in old forests and dense wooded areas, and although it is not currently threatened, it is vulnerable to habitat loss and human disturbance.

The European Polecat is a small carnivore found primarily in Europe, inhabiting a variety of environments such as forests, meadows, and agricultural areas. It measures about 45 to 60 cm in length, with a tail of 20 to 30 cm, and weighs between 0.8 and 1.5 kg. Its fur is generally light brown or gray, with lighter underparts and a distinctive black mark on its face, surrounding its eyes. The European Polecat is a nocturnal and opportunistic predator, primarily feeding on small mammals, birds, eggs, as well as fruits and insects. While it is often perceived as a pest by farmers, it plays an important role in regulating populations of small animals. Its population is generally stable, but it can be threatened by habitat loss and road collisions.

The Boana pulchella, commonly known as the Elegant Tree Frog, is a species of amphibian in the Hylidae family. It is primarily found in South America, particularly in Argentina, Brazil, and Uruguay. This frog is recognizable by its smooth skin and vibrant colors, usually green with shades of yellow and brown. It measures about 3 to 5 cm in length. The Boana pulchella is an arboreal species that prefers humid habitats, such as tropical and subtropical forests. It is mainly active at night, feeding on insects and other small invertebrates. Although its conservation status is currently "least concern," it is threatened by the loss of its natural habitat due to deforestation and urbanization.

The European Tree Frog, or Hyla arborea, is a small arboreal frog native to Europe. It is characterized by its smooth skin and bright green color, although some may exhibit shades of brown or gray. Typically measuring between 3 and 5 cm, it has adhesive pads on its fingers, allowing it to climb easily on plants and trees. It is often found near stagnant water bodies, such as ponds and marshes, where it breeds. Its call, a loud croak, is particularly noticeable during the breeding season. Although primarily nocturnal, it can be seen basking in the sun during the day.

The Eurasian robin is a small bird from the Muscicapidae family, easily recognized by its bright red breast. It is widely distributed across Europe, Western Asia, and North Africa. This bird is mostly active during the day, feeding mainly on insects, worms, and berries. Although very territorial, it is admired by photographers for its curious nature and active behavior.

The Eurasian reed warbler is a small migratory passerine, 11–13 cm long, with olive-brown plumage and a repetitive, hiss-like song. It inhabits reed beds and freshwater marshes, feeding on insects and larvae. During the breeding season, the male sings from an exposed perch and the pair builds a vase-shaped woven nest within dense reed vegetation.

The Eastern hellbender is one of the largest salamander species in the world, growing up to 75 cm in length. It primarily inhabits clear rivers and streams in the United States, where it hides among rocks and feeds on small aquatic invertebrates. This amphibian is particularly sensitive to water pollution and habitat loss. Due to these threats, the Eastern hellbender is classified as a vulnerable species.

The Wild Boar is a large omnivorous mammal found primarily in forests, wooded areas, and mountains of Europe, Asia, and North Africa. It measures between 1.2 and 1.8 meters in length, with a tail of 15 to 25 cm, and weighs between 50 and 100 kg, though some specimens can reach up to 200 kg. Its fur is typically brown, with darker hair on the back and lighter on the sides. The Wild Boar is a nocturnal animal, primarily feeding on roots, fruits, seeds, insects, and small animals. While it is considered game, it can sometimes pose a threat to agricultural crops due to its tendency to root through the soil. This species is widely distributed, and its population remains relatively stable, although it is sometimes threatened by excessive hunting and habitat loss.