Lark v. i. : A frolic; a jolly time.

Lark v. i. : To sport; to frolic.

Lark n. : Any one numerous species of singing birds of the genus Alauda and allied genera (family Alaudidae). They mostly belong to Europe, Asia, and Northern Africa. In America they are represented by the shore larks, or horned by the shore larks, or horned larks, of the genus Otocoris. The true larks have holaspidean tarsi, very long hind claws, and usually, dull, sandy brown colors.

Lark v. i. : To catch larks; as, to go larking.

Example:
How do you make Lark ammo shoot mini bullets out of it in Resistance Fall of Man on the PS3?

Taxonomy
Larks, Genus, species, the larks, Kikkawa, American Ornithologists' Union, the American, ground, 06-24, family Alaudidae, free encyclopedia, birds, seeds, check-list, species nest, nest, bills, Alauda arvensis.

Defination from the web:
Larks are passerine birds of the family Alaudidae. ... Like many ground birds, most lark species have long hind claws, which are thought to provide stability while standing. ... Some larks have heavy bills (reaching an extreme in the Thick-billed Lark) for cracking seeds open, while ...