The term 'Cousin of a Lark' can be solved by the crossword solution 'SWALLOW' (7 letters). The SWALLOW is a type of bird that is closely related to the lark, and is therefore considered its cousin. Swallows are small birds with long, pointed wings and forked tails, and they are known for their aerial acrobatics. They are found on every continent except Antarctica, and they feed on insects which they catch in flight.