American Starling

Adult American Starlings are medium-sized birds with a robust body and short tail. Their plumage is predominantly black but shines with purples and greens due to iridescence. In winter, they exhibit white spots, giving them a speckled appearance. The bill is pointed and yellow in the breeding season, turning darker in winter. Juveniles are duller, with grayish-brown plumage and lack the iridescent sheen of adults. Males and females look similar, though females may appear slightly duller. Differentiating them from other blackbirds is straightforward due to their unique plumage and behavior. The European Starling, which is not native to North America, can be confused with the American variety; however, the latter has more pronounced iridescence and a distinct vocal range. In flight, the American Starling has a triangular shape with pointed wings and a short tail. When perched, it stands upright, often tilting its head while observing its surroundings.

The American Starling has a varied diet, primarily consisting of insects and other invertebrates. During the breeding season, it relies heavily on caterpillars, beetles, and spiders to feed its young. In the fall and winter, its diet shifts to include more plant material, such as seeds, berries, and grains. The starling forages on the ground, using its strong beak to probe and open the soil for hidden prey. It is also known to feed on fruit, sometimes causing damage to orchards and vineyards. Its feeding schedule is primarily diurnal, with peak activity during the early morning and late afternoon.

American Starlings are highly social birds, often seen in large flocks. During the breeding season, they become territorial, with males displaying by singing and showing off their iridescent plumage to attract mates. Nesting sites are vigorously defended from other starlings and cavity-nesting competitors. Outside of the breeding season, starlings form large communal roosts, especially in urban areas, where they gather in the thousands. These flocks perform elaborate aerial displays, known as murmurations, which serve both to confuse predators and to communicate among themselves. Starlings are generally active during daylight hours, with a peak in foraging activity during the morning.

The American Starling nests in cavities, using locations such as tree holes, building crevices, and nest boxes. It constructs its nest from a variety of materials, including grass, twigs, and feathers, often lining the interior with softer materials. The female lays between 4 to 6 eggs per clutch, which are pale blue. Incubation lasts about 12 days, primarily undertaken by the female, though the male may occasionally assist. The young fledge approximately 21 days after hatching. Starlings are capable of raising two broods per year, with both parents feeding the chicks. The availability of suitable nesting sites is a limiting factor for their breeding success.

The American Starling is known for its complex vocalizations, which include a mix of whistles, clicks, and mimicry. Its primary song is a series of squeaky notes, trills, and warbles that vary in pitch and rhythm. Starlings are adept mimics, often incorporating sounds from their environment, such as car alarms and other bird species. Their call notes are sharp and persistent, often used to communicate with flock members. Alarm calls are harsher, serving to alert others of potential threats. During the dawn chorus, males sing vigorously to establish territory and attract mates.

• 1The American Starling's iridescent plumage results from microscopic structures in its feathers, not pigmentation.
• 2A group of starlings is known as a murmuration, famous for its fluid, synchronized flight patterns.
• 3In 1890, 100 starlings were introduced in New York City's Central Park, leading to their widespread presence in North America.
• 4American Starlings can mimic the calls of up to 20 different bird species as well as mechanical sounds.
• 5They are capable of flying at speeds up to 48 kilometers per hour, making them swift and agile in the air.
• 6Starlings have a lifespan of up to 15 years, although the average in the wild is closer to two to three years.
• 7Their diet flexibility allows them to thrive in diverse environments, from urban centers to agricultural lands.

The American Starling is listed as a species of least concern by the IUCN. Its population is stable, with an estimated 150 million individuals across North America. Despite being an introduced species, it has successfully integrated into many ecosystems, though it poses competition to native cavity-nesting birds. Primary threats include habitat destruction and changes in agricultural practices that reduce food availability. Conservation efforts focus on managing populations in areas where they compete with native species. Historically, the starling population increased rapidly following its introduction but has since stabilized.