Top 20 Most Common Bird in Olt

The great Cormorant is a charismatic bird known for its diving abilities and fishing prowess. It has a glossy black plumage, a long neck, and a hooked beak. It is strong swimmers and divers, capable of reaching depths up to 30 feet to catch fish. It has a unique habit of spreading their wings in the sun to dry them after fishing, helping to maintain their waterproof feathers.

The pygmy cormorant (Microcarbo pygmaeus) is a member of the Phalacrocoracidae (cormorant) family of seabirds. It breeds in south-eastern Europe and south-western Asia. It is partially migratory, with northern populations wintering further south, mostly within its breeding range. It is a rare migrant to western Europe.

The grey Heron is a very common species to come across in marine, brackish, and freshwater ecosystems; these habitats must have at least four months of warm weather or else these birds will migrate for new breeding grounds. The grey Heron hunts by wading through shallow waters looking for fish and various invertebrates; their natural diet helps control some aquatic species populations.

The mallard is the most abundant duck species in the world, and the ancestor of all domestic ducks. Only the female can produce the distinctive "quack" sound. When the female lays eggs, the male abandons its mate, while the protective mother stays with the ducklings for a long time. This migratory species inhabits shallow waters and it's one of the most popular game birds.

These tall birds are quite distinctive with their bright white feathers, black legs, and orange beaks. Great Egrets live near both fresh and saltwater, nesting high in trees to protect their eggs from predatory mammals. They are colonial nesters, living in large groups (colonies), and they find the majority of their food in the nearest body of water.

The common Chaffinch has a varied diet, mainly feeding on seeds and berries, but also eating insects, allowing it to thrive in different habitats. The Common Chaffinch is also known for its melodic song, with the males being particularly vocal during the breeding season. Their songs can often be heard in the spring and early summer.

The water Pipit is a charming bird commonly found near water bodies like marshes, rice fields, and wetlands. The bird is highly adaptable and hardy, able to survive in harsh conditions and a variety of habitats. It feeds on a range of insects, seeds, and small prey and uses its long legs to wade in shallow water in search of food.

Unafraid of humans, the dark-winged eurasian Blackbird has gained a great deal of cultural significance, mentioned in popular nursery rhymes and songs across the world. Elegant and with an appealing song, they can be aggressive when they are in their breeding period.

The adult black-throated loon is 58 to 73 cm (23 to 29 in) in length with a 100 to 130 cm (39 to 51 in) wingspan and a weight of 1.3 to 3.4 kilograms (2.9 to 7.5 lb). The nominate subspecies in its breeding plumage has a grey head and hindneck, with a black throat and a large black patch on the foreneck, both of which have a soft purple gloss. The lower throat has a necklace-shaped patch of short parallel white lines. The sides of the throat have about five long parallel white lines that start at the side of the patch on the lower throat and run down to the chest, which also has a pattern of parallel white and black lines. The rest of the underparts, including the centre of the chest, are pure white. The upperparts are blackish down to the base of the wing, where there are a few rows of high contrast white squares that cover the mantle and scapulars. There are small white spots on both the lesser and median coverts. The rest of the upperwing is a blackish colour. The underwing is paler than the upperwing, and the underwing coverts are white. The tail is blackish. The bill and legs are black, with a pale grey colour on the inner half of the legs. The toes and the webs are grey, the latter also being flesh coloured. The irides are a deep brown-red. The sexes are alike, and the subspecies viridigularis is very similar to the nominate except that the former has a green throat patch, instead of black. The subspecies viridigularis does still retain a purplish gloss, although it is less than the nominate. The non-breeding adult differs from the breeding adult in that the cap and the back of the neck are more brownish. The non-breeding adult also lacks the patterned upperparts of the breeding adult, although some of the upperwing coverts do not lose their white spots. This results in the upperparts being an almost unpatterned black from above. The sides of the throat are usually darker at the white border separating the sides of the throat and the front of the throat; most of the time a thin dark necklace between these two areas can be seen. There is white on the sides of the head that are below the eye. The bill is a steel-grey with, similar to the breeding adult, a blackish tip. The juvenile is similar to the non-breeding adult, but has a browner appearance. It has a buffy scaling on the upperparts that is especially pronounced on the scapulars. The lower face and front of the neck has a diffused brownish tinge. The juvenile does not have the white spots on the wing coverts, and its irides are darker and more dull in colour. The chick hatches with down feathers that range in colour from sooty-brown to brownish-grey, usually with a slightly paler head. The abdomen is pale. The black-throated loon can be distinguished from the Pacific loon by the white on the flanks of the former.

The caspian Gull is a majestic bird. This gull is a common sight in the coastal areas around the Black and Caspian Seas, where it feeds on a variety of food including fish, insects, and rodents. It is known for its agility and can be seen soaring high in search of food.

All the treecreepers are similar in appearance, being small birds with streaked and spotted brown upperparts, rufous rumps and whitish underparts. They have long decurved bills, and long stiff tail feathers which provide support as they creep up tree trunks looking for insects. The short-toed treecreeper is 12.5 centimetres (4.9 inches) long and weighs 7.5–11 g (0.26–0.39 oz). It has dull grey-brown upperparts intricately patterned with black, buff and white, a weak off-white supercilium and dingy underparts contrasting with the white throat. The sexes are similar, but juveniles have whitish underparts, sometimes with a buff belly. The call of this species is a repeated shrill tyt...tyt tyt-tyt and the song of the nominate subspecies is an evenly spaced sequence of notes teet-teet-teet-e-roi-tiit. There is some geographical variation; the song of Danish birds is shorter, that of the Cyprus subspecies is very short and simple, and the North African version is lower pitched. European birds do not respond to latter two song variants. This species shares much of its range with the common treecreeper. Compared to the short-toed, that bird is whiter below, warmer and more spotted above, and has a whiter supercilium and slightly shorter bill. However, identification by sight may be impossible for poorly-marked birds. Vocal birds are usually identifiable, since Common has a distinctive song composed of twitters, ripples and a final whistle and a shree' call rarely given by the short-toed; however, both species have been known to sing the other's song. Even in the hand, although the short-toed usually has a longer bill and shorter toes, 5% of birds are not safely identifiable. The brown treecreeper has never been recorded in Europe, but would be difficult to separate from the short-toed treecreeper, which it much resembles in appearance. Its call is more like the common treecreeper's, but a vagrant brown treecreeper might still not be possible to identify with certainty given the similarities between the three species.

Yellow-legged Gull is a large seagull that can be found along coastal regions of the Mediterranean Sea and the Atlantic Ocean. It has a distinctive yellow coloration on its legs and beak, giving it its name. It is an opportunistic feeder, and known to be very territorial. Some populations of Yellow-legged Gulls are migratory, traveling long distances to breed during the summer months.

The eurasian Wigeon is a medium-sized duck with its primary breeding grounds in northern England and Scotland. It is often seen near ponds and marshes where the duck searches for edible aquatic plants. Due to its declining numbers in Europe, the duck is listed on the amber list for species.

Look for great Crested Grebe in areas with plenty of reeds. This water bird uses the reeds to build floating nests on rivers, lakes, and reservoirs. While the bird joins flocks in the winter, it is territorial. Breeding pairs will defend the area around their nest. The bird forages for insects, small fish, and other aquatic life along the shore.

The most common inhabitant of urban lakes and one of the heaviest of all flying birds, the mute Swan got its name by being less noisy than other swan species. Although stunningly beautiful and graceful, it is also quite aggressive and territorial. The national bird of Denmark, the mute Swan is famously portrayed in Hans Christian Andersen's fairytale "Ugly Duckling" and Tchaikovsky's ballet "Swan Lake".

Tiny and usually well-camouflaged with its brown plumage, the eurasian Wren is a fairly populous bird that may sometimes be seen hopping quickly and quietly along a forest floor, rustling sticks and flipping over leaves as it searches for insects. The species, though, is more often heard than seen; though quite small, the eurasian Wren has a loud, melodious song.

This huge bird is by a slight margin the largest of the pelican species and one of the largest living flying bird species. It measures 160 to 183 cm (5 ft 3 in to 6 ft 0 in) in length, 7.25–15 kg (16.0–33.1 lb) in weight and 245 to 351 cm (8 ft 0 in to 11 ft 6 in) in wingspan. Its median weight is around 11.5 kg (25 lb), which makes it perhaps the world's heaviest flying bird species, although the largest individuals among male bustards and swans may be heavier than the largest individual Dalmatian pelican. More recently, six male Dalmatians were found to average 10.4 kg (23 lb) and four females 8.7 kg (19 lb), around the same average weight as the great white pelican (Pelecanus onocrotalus) and slightly lighter than mean body masses from other huge birds such as the trumpeter swan (Cygnus buccinator) or Andean condor (Vultur gryphus). A mean estimated body mass for the Dalmatian pelican of 10.9 kg (24 lb) was also published, around the same mass as the aforementioned largest swan and condor. It is either the heaviest or one of the heaviest birds native to Europe, its closest rival in mass being mute swans (Cygnus olor), which weighs on average around 10.1 kg (22 lb), followed closely by the cinereous vulture (Aegypius monachus) (whose average weight is not known) and the whooper swans (Cygnus cygnus), averaging at just shy of 9.5 kg (21 lb), and the great white pelican. These same five species are probably rank as the largest flying birds in Asia as well, alongside the Himalayan vulture (Gyps himalayensis). It also appears to have one of the largest wingspans of any living bird, rivaling those of the great albatrosses (Diomedea ssp., in particular the two largest species, the wandering albatross and southern royal albatross) and the great white pelican. These four species are the only modern birds with verified wingspans that range over 350 cm (11 ft 6 in). The somewhat similar-looking great white pelican broadly overlaps in size but has greater size sexual dimorphism: female great whites can be noticeably smaller than female Dalmatians but male individuals of the two species are essentially the same size and weight. However, the Dalmatian differs from this other very large species in that it has curly nape feathers, grey legs and silvery-white (rather than pure white) plumage. In winter, adult Dalmatian pelicans go from silvery-grey to a dingier brownish-grey cream colour. Immature birds are grey and lack the pink facial patch of immature white pelicans. The loose feathers around the forehead of the Dalmatian pelican can form a W-like-shape on the face right above the bill. In the breeding season it has an orange-red lower mandible and pouch against a yellow upper mandible. In winter, the whole bill is a somewhat dull yellow. The bill, at 36 to 45 cm (14 to 18 in) long, is the second largest of any bird, after the Australian pelican (Pelecanus conspicillatus). The bare skin around the eye can vary from yellow to purplish in colour. Among standard measurements, compared to the great white pelican, the Dalmatian's tarsus is slightly shorter, at 11.6 to 12.2 cm (4.6 to 4.8 in), but its tail and wing chord length are notably larger, at 22 to 24 cm (8.7 to 9.4 in) long and 68 to 80 cm (27 to 31 in), respectively. When the Dalmatian pelican is in flight, unlike other pelicans, its wings are solid grayish-white with black tips. It is an elegant soaring bird. When a whole flock of Dalmatian pelicans is in flight, all its members move in graceful synchrony, their necks held back like a heron's. The Dalmatian pelican is often silent, as most pelicans tend to be, although it can be fairly vocal during the mating season, when it may engage in a wide range of guttural, deep vocalisations, including barks, hisses and grunts.

Horned grebe can be easily recognised by its red-and-black alternate (breeding) plumage, its black-and-white basic (non-breeding) plumage and its characteristic "horns". It is 31–38 cm long, has a wingspan 55–74 cm wide and weighs 300–570 g. It has a moderately long neck, flat forehead and a rear crown of black feathers. Its beak is straight and pointy with a white tip. Both subspecies are physically similar, with P. a. auritus (Palearctic) appearing darker than P. a. cornutus (North America), which has light grey feathers on its back, which are inconspicuous or absent in P. a. auritus. The horned grebe is often confused with the black-necked grebe, which is similar in size and colouring but differentiates by a steeper forehead, a more slender bill and a fluffier rump. The alternate (breeding) plumage of the horned grebe has bright erectable "horns", black fan-shaped cheek feathers and an overall red-and-black colour. The neck, flanks, lores and upper-chest are chestnut brown, while the crown and back are black. The belly is a dull white. Males are slightly larger and brighter than females but are generally indistinguishable. The basic (non-breeding) plumage is overall black and white. The neck, chest and cheeks are white, while the back and crown are a dull black-grey. The border between the crown and the cheeks extend in a straight line behind the eyes. The basic plumage does not have the "horns". Juveniles appear similar to a non-breeding adult except they are a slightly duller shade of white and their back is tinged with brown. The line separating the cheeks and crown is less distinct and their beak is paler. The chicks are fluffy, with a dull grey back, a white belly and interesting black-and-white facial striping.

Similar in appearance, all treecreepers are small birds with streaked and spotted brown upperparts, rufous rumps and whitish underparts. They have long decurved bills, and long rigid tail feathers that provide support as they creep up tree trunks looking for insects. The Eurasian treecreeper is 12.5 cm (4.9 in) long and weighs 7.0–12.9 g (0.25–0.46 oz). It has warm brown upperparts intricately patterned with black, buff and white, and a plain brown tail. Its belly, flanks and vent area are tinged with buff. The sexes are similar, but the juvenile has duller upperparts than the adult, and its underparts are dull white with dark fine spotting on the flanks. The contact call is a very quiet, thin and high-pitched sit, but the most distinctive call is a penetrating tsree, with a vibrato quality, sometimes repeated as a series of notes. The male's song begins with srrih, srrih followed in turn by a few twittering notes, a longer descending ripple, and a whistle that falls and then rises. The range of the Eurasian treecreeper overlaps with that of several other treecreepers, which can present local identification problems. In Europe, the Eurasian treecreeper shares much of its range with the short-toed treecreeper. Compared to that species, it is whiter below, warmer and more spotted above, and has a whiter supercilium and slightly shorter bill. Visual identification, even in the hand, may be impossible for poorly marked birds. A singing treecreeper is usually identifiable, since short-toed treecreeper has a distinctive series of evenly spaced notes sounding quite different from the song of Eurasian treecreeper; however, both species have been known to sing the other's song. Three Himalayan subspecies of Eurasian treecreeper are now sometimes given full species status as Hodgson's treecreeper, for example by BirdLife International, but if they are retained as subspecies of Eurasian, they have to be distinguished from three other South Asian treecreepers. The plain tail of Eurasian treecreeper differentiates it from bar-tailed treecreeper, which has a distinctive barred tail pattern, and its white throat is an obvious difference from brown-throated treecreeper. Rusty-flanked treecreeper is more difficult to separate from Eurasian, but has more contrasting cinnamon, rather than buff, flanks. The North American brown creeper has never been recorded in Europe, but an autumn vagrant would be difficult to identify, since it would not be singing, and the American species' call is much like that of Eurasian treecreeper. In appearance, brown creeper is more like short-toed than Eurasian, but a vagrant might still not be possible to identify with certainty given the similarities between the three species.

The tufted Duck’s distinctive plumage sets it apart from other species. During the warmer months, the duck is commonly found on lakes and marshes but moves to the sea in the winter. It typically forms flocks in the winter where it spends the day sleeping. The duck often dives into the water in search of aquatic plants and insects.