According to the United States Geological Center's Northern Prairie Wildlife Research Center, a group of swans is called a bevy. They can also be referred to as a wedge of swans, if in flight.
A male swan is called a cob, and a female swan is called a pen. Young swans are called cygnets. Swans usually mate for life and protect each other. According to How Stuff Works, they often hold loud celebrations after the pair fights off an intruder together.
Other group names for common birds include: a parliament of owls, a murder of crows, a wake of buzzards, a charm of finches, a host of sparrows and a mustering of storks.