Ask the Swan Specialist

The Twelve Days of Christmas: Bubbles and Swans a-Swimming
Date: 6 August 2016

Im' doing a 12 days of Christmas gifts, and for the swans swimming they said to give a bottle of bubbles. What do bubbles have in common with swans? I can't find anything on the internet that answers this question. Any input you can give me on how bubbles relate to swans will be appreciated.