This phrase is often used figuratively to describe someone who is:
* Early riser: Larks are known for their habit of waking up and singing at dawn.
* Cheerful and energetic: The singing of a lark is often associated with happiness and vitality.
* Free-spirited: Larks are wild birds, representing a sense of freedom.
It's important to note that the phrase doesn't always have a literal meaning. It can also be used as a playful or metaphorical way of describing someone's personality traits.