In Hindu mythology, Saraswati is the goddess of wisdom, knowledge, and music. Her vahana (vehicle) is a swan called Hans, which symbolizes grace, purity, and the ability to discriminate between right and wrong (like the swan's legendary ability to separate milk from water). The other options are vehicles of other deities: Garuda is Vishnu's mount, Nandi is Shiva's bull, and buffalo is Yamraj's vehicle.