A lark can refer to different things depending on the context. Here are some possible meanings:

• Bird: A lark is a small, brown songbird known for its beautiful singing.

• Morning person: A lark, early bird, or A-person is a person who usually gets up early in the morning and goes to bed early in the evening. The term relates to the birds known as larks, which are known to sing before dawn. Human "larks" may sleep from around 10 p.m. to 6 a.m. (or earlier), and tend to feel most energetic just after they get up in the morning).

• Activity: A lark can also refer to an activity done for enjoyment or amusement, often unplanned and carefree. For example, exploring a new place with friends or trying something new on a whim can be described as a lark.

• Verb: To lark means to engage in harmless fun or mischief, often used with the preposition "about".

In summary, a lark can be a type of bird, a morning person, an enjoyable activity, or a verb meaning to engage in harmless fun or mischief.