Birds
Eastern Meadowlark
Sturnella magna · also called eastern meadowlarks
A clear, flute-like whistle drifts across an open pasture, and the source turns out not to be a lark at all but an eastern meadowlark, a blackbird relative that keeps itself genetically separate from its near-twin sibling species through song alone.
Overview
The eastern meadowlark, Sturnella magna, is a grassland songbird native to open pasture and agricultural habitat across the eastern and central United States, Mexico, and Central America. Its bold black-and-yellow breast marking, flute-like song, and remarkable song-based reproductive isolation from the nearly identical western meadowlark make it one of the more behaviourally fascinating grassland birds in North America.
A twin kept apart by sound alone
Where the eastern and western meadowlark ranges overlap, the two look close enough to confuse even careful observers, yet each stays faithful to its own species almost entirely because of how the other one sings.
Status
Near Threatened — declining significantly alongside the loss of native grassland habitat across much of its range.
Eastern Meadowlark: common questions
Is the eastern meadowlark actually a type of lark?
No, despite its common name, the eastern meadowlark belongs to the blackbird family Icteridae rather than the true lark family, and the name reflects only a general resemblance in habitat and appearance rather than any close evolutionary relationship to true larks.
How can you tell an eastern meadowlark from a western meadowlark?
The two species look almost identical where their ranges overlap, so the most reliable way to tell them apart is by song, since the eastern meadowlark produces a clear, flute-like whistle while the western meadowlark's song is more complex and gurgling, a difference the birds themselves use to avoid interbreeding.
Why doesn't the eastern meadowlark interbreed with the western meadowlark?
Even though the two species look nearly identical and their ranges overlap in parts of the central United States, each species recognises and responds mainly to its own distinct song, a behavioural difference that keeps the two largely reproductively isolated despite their close relationship and similar appearance.
Why are eastern meadowlark populations declining?
Eastern meadowlark numbers have declined significantly in recent decades as native grassland habitat has been converted to intensive agriculture and development across much of its range, reducing the open, insect-rich grassland the species depends on for both nesting and foraging.