(BIRD), skylark [noun] [C] - a small bird which builds its nest on the ground and is well known for singing while it flies(esp. UK) I'm catching a train at six o'clock in the morning, so I'll have to be up with the lark (= get out of bed very early).
LARK
Meaning of LARK in English
Cambridge English vocab. Кембриджский английский словарь. 2012