Skylark \Sky"lark`\, n. (Zo["o]l.) A lark that mounts and sings as it files, especially the common species (Alauda arvensis) found in Europe and in some parts of Asia, and celebrated for its melodious song; -- called also sky laverock. See under Lark.

Note: The Australian skylark (Cincloramphus cantillans) is a pipit which has the habit of ascending perpendicularly like a skylark, but it lacks the song of a true lark. The Missouri skylark is a pipit (Anthus Spraguei) of the Western United States, resembling the skylark in habit and song.

Source: Webster's Revised Unabridged Dictionary (1913)