Top 20 Most Common Bird in Buenos Aires
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The rufous Hornero is a medium-sized ovenbird, found in South America. It is recognized as the national bird in Uruguay and Argentina. Scientifically known as Furnarius rufus, you can differentiate the male from the female depending on how quickly their wings beat while they sing.

Patagioenas picazuro is a brown bird with white dashes on the back of its neck and darker brown wing patterns. It is similar in appearance to the spotted dove.

This species is named after its distinctive reddish-orange underparts. Rufous-bellied thrushes can reach a length of 25 cm and weigh up to 68 g (male) or 78 g (female), though weights of about 59 g for males and 64 g for females are more usual. Contrary to what one might expect from the rather marked weight difference, the females are not larger, only plumper; their tarsus is actually a bit shorter than that of males on average.

The most widely-spotted dove of South America, the small eared Dove thrives in high altitudes. You can find this dove in the scrubland of areas that are around 4500 meters above sea level. Their easy association with humans has made them acclimate more easily to urban environments and rising human population levels.

The great Kiskadee is a large bird with bold markings that make this flycatcher easily recognizable. is a bright-colored bird that prefers woodland habitats close to water or open areas. It eats a lot of insects, but also forages for seeds and berries and is known to dive into shallow water for small fish.

Monk Parakeets, popular pet birds originally native to South America, established wild populations in the United States in the 1960s. These noisy, bright green parrots can now be seen flying around together in U.S. cities like Chicago and New York! They nest communally, dozens of them living together in huge multi-family nests atop power poles and in trees. Messy and loud, they are considered a nuisance and invasive species in the United States.

The rock Pigeon is a wild ancestor of all domestic and feral pigeons, inhabiting coasts, cliffs, and caves. Pairs nest in rock crevices, often mating for life. They are known for their ability to fly very long distances to return to their homes, navigating using the sun's position and the earth's magnetic fields. Thanks to this ability, pigeons were used as messengers, particularly during World Wars I and II.

The species has four subspecies:

The rufous-collared Sparrow is a small songbird known for its pleasant vocalization and numerous "dialects." The songs peak at dawn and some individuals can sing continuously for half an hour. Found in a wide range of habitats and comfortable around humans, this ground-feeding bird is easily approachable. On the other hand, it's aggressive towards other birds that enter its territory. Individuals have their favorite perching spot where they appear repeatedly.

Watch out for the small yet aggressive house Wrens; they are extremely territorial and think nothing of harassing other birds and their nestlings if they want to take their spot! They have been known to kill nestlings and even adult birds to get a nest hole they want. Once house Wrens lay eggs, the nest needs to stay below 100 degrees and above 65 degrees or the eggs will not survive—this could be the reason they are so particular about their nesting spots.

It has a total length of 50–65 cm (20–26 in) and a wingspan of 120–132 cm (47–52 in). Weight is 0.9-1.6 kg (2-3.5 lbs), averaging 1,348 g (2.972 lb) in 7 birds from Tierra del Fuego. Individuals from the colder southern part of its range average larger than those from tropical regions (as predicted by Bergmann's rule) and are the largest type of caracara. In fact, they are the second largest species of falcon in the world by mean body mass, second only to the gyrfalcon. The cap, belly, thighs, most of the wings and tail-tip are dark brownish, the auriculars, throat and nape are whitish-buff, and the chest, neck, mantle, back, uppertail-coverts, crissum (the undertail coverts surrounding the cloaca) and basal part of the tail are whitish-buff barred dark brownish. In flight, the outer primaries show a large conspicuous whitish-buff patch ('window'), as in several other species of caracaras. The legs are yellow and the bare facial skin and cere are deep yellow to reddish-orange. Juveniles resemble adults, but are paler, with streaking on the chest, neck and back, grey legs, and whitish, later pinkish-purple, facial skin and cere. It can be separated from the similar northern caracara by its more extensive barring on the chest, brownish and often lightly mottled/barred scapulars (all blackish in northern), and pale lower back with dark barring (uniform blackish in northern). Individuals showing intermediate features are known from the small area of contact in north-central Brazil, but intergradation between the two species is generally limited.

The harris's Hawk has a unique personality trait that sets it apart from other raptors. It is a social bird that hunts and nests in groups. Most females lay their eggs in the spring, but it is not uncommon for two or three clutches to occur when food is plentiful. The raptor primarily hunts small mammals, but juveniles are known to eat insects.

It has a total length of approximately 18 cm (7 in). It is overall ashy-brown with contrasting black lores and rufous wings. The taxon fringillarius has more black in the face and is overall more rufescent (less ashy). It is social and commonly seen in small groups. Unlike the "true" cowbirds in the genus Molothrus, this species is not a brood parasite. In contrast, the screaming cowbird is a brood parasite of the grayish baywing, and while adult screaming cowbirds are overall blackish, juvenile screaming cowbirds closely resemble grayish baywings.

This species is from 37 to 40 cm long. A typical chimango caracara has a mantle and back edged with cinnamon brown feathers and white. Neck, chest, abdomen and belly light brown. Head dark brown. It is the smallest variety of caracara. Wings have a dark brown stripe with white in the basal half of the primaries. The tail is light brown with a dark brown terminal band. Eyes are brown. Legs are yellow in the male and light gray in the female and hatchlings.

The shiny Cowbird is named after its glossy feathers and close association with cattle. These birds are considered brood or nest parasites because they manipulate other species to incubate their eggs for them. This has caused some species' populations to suffer, especially in non-native regions where the shiny Cowbird has been introduced.

Just as its name implies, the little house Sparrow socializes with humans more than any other bird species. Able to adapt and thrive in almost any habitat, excluding the extremes such as deserts and mountain peaks, this species was once restricted only to North Africa and Eurasia but now is found across the globe. Unfortunately, this opportunistic eater is not completely harmless—it can cause considerable damage to crops.

The european Starling, a large, hardy songbird, is one of the most commonly seen bird species in North America. Originally from Europe, this species was brought to the U.S. in the 1890s by enthusiasts of William Shakespeare, who had the unique goal of bringing over every single species of bird that was mentioned in Shakespeare's collective works. Unfortunately, the european Starling, being an adaptable, generalist species, spread invasively across the continent, hurting many native species' populations in the process.

Adult grey-breasted martins are 18 cm (7.1 in) in length, with a forked tail and relatively broad wings, and weigh 39 g (1.4 oz). Adult males are a glossy blue-black with the grey-brown throat, breast and sides contrasting with the white lower underparts. Females are duller than the male, and juveniles have dull brown upperparts.

The glittering-bellied emerald (Chlorostilbon lucidus) is a species of hummingbird in the family Trochilidae. It has widely been listed by the scientific name Chlorostilbon aureoventris, but this was shown to be mistaken by J. F. Pacheco and B. M. Whitney in 2006. It is found in north-eastern Argentina, eastern and central Bolivia, eastern Brazil, Paraguay, and Uruguay. It is widespread and often common in a wide range of semi-open habitats, including gardens and parks.

This lapwing is the only crested wader in South America. The upperparts are mainly brownish grey. The head is particularly striking; mainly grey with a black forehead and throat patch extending onto the black breast. The rest of the underparts are white, and the eye ring, legs and most of the bill are pink. It is equipped with red bony extensions under the wings (spurs), used to intimidate foes and fight birds of prey. The rump is white and the tail black.