European Starling

The European starling, *Sturnus vulgaris*, is a medium-sized passerine, typically weighing 75–90g with a length of 19–23 cm and a wingspan of 31–44 cm. Its plumage transitions from an iridescent oily black with prominent white speckles in winter to a less-spotted, glossy black during breeding season, complemented by a distinctive yellow bill in spring and summer that darkens to black in autumn and winter. Sexual dimorphism is subtle, with males often having slightly longer, less pointed throat feathers and a bluish bill base, while females exhibit reddish bill bases. These birds typically live 2–3 years but can reach 15 years in captivity, completing two broods of 4–6 sky-blue eggs per season after an 11–13 day incubation period, with young fledging in 20–22 days. They are highly adaptable to temperate climates.

Starlings exhibit complex social structures, forming massive, highly coordinated flocks known as murmurations during non-breeding seasons, sometimes numbering in the hundreds of thousands to over a million individuals, primarily for predator evasion and information exchange. They are aggressive and territorial, especially concerning nesting sites, and actively evict or destroy the eggs and young of native cavity-nesting species such as bluebirds, flickers, and woodpeckers, significantly impacting local avian biodiversity. Their omnivorous diet includes a wide range of invertebrates like grasshoppers, beetles, and caterpillars, as well as fruits, seeds, and grains, making them significant agricultural pests. During foraging, they employ a distinctive “open-billed probing” technique to locate subsurface insects. Their vocalizations are varied, including whistles, clicks, and mimicry of other bird calls and even human speech.