Bird populations in Switzerland are showing a range of trends, with some species thriving due to conservation efforts and climate change, while others are declining. Overall, European bird populations are in decline, but Switzerland has seen a number of species adapting to new conditions. For instance, the Egyptian vulture, typically found in the Mediterranean, has established about fifteen nesting pairs in Switzerland since 2012. This increase is likely due to the warming climate and the availability of reptiles as a food source. Similarly, pink flamingos have been spotted in the canton of Argovia during the autumn of 2025, although they are not expected to settle there permanently. Several bird species that are sensitive to cold are expanding their ranges northward because of the warming climate. The Cetti's warbler, which previously lived in the Ticino basin, has now been observed in the canton of Geneva. Meanwhile, the reed warbler has set a record with 25 to 27 territories in 2025. The great egret, once hunted for its feathers, has made a comeback thanks to protection measures, with more sightings in Switzerland between October and March. The bearded vulture, which was eradicated by humans in the past, has returned due to a reintroduction project launched in the 1980s. In 2025, 35 nesting pairs were recorded in the Swiss Alps, double the number from 2017. Conservation efforts have also helped species like the ortolan, whose population dropped by 80% since the 1990s, and the red-legged partridge, which has benefited from the creation of flowered fallow lands. The common raven and collared dove have adapted well to urban environments, with the common raven's nesting pairs in cities outnumbering those in rural areas. The red-legged partridge population in Switzerland has increased since the 1990s, partly due to improved water quality that allows them to find their preferred algae. Other introduced species, such as the trumpeter swan, are also increasing in numbers due to abundant food and milder winters. Artificial islands have helped stabilize the tern population, which had previously declined due to river modifications. The black-headed gull population relies on conservation measures, including the protection of nests in agricultural areas. In 2026, the black stork nested in Switzerland for the first time in 120 years, with three young surviving the season. The osprey, reintroduced in 2015, had its first successful nesting in Switzerland in 2026. The great cormorant and goosander have faced criticism for their impact on aquatic environments. The goosander population reached between 700 and 900 nesting pairs in 2025. According to the Swiss Bird Index, 99 out of 180 nesting bird species in Switzerland are increasing, with raptors benefiting from protection measures. However, 21 exotic species have nested in Switzerland, some of which pose threats to native biodiversity. The European Environment Agency reports that 65% of species studied show more positive evolution in Switzerland than in Europe, though this trend hides the decline of some native species.