Creature: Pygmy Puff

Say hello to the Pygmy Puff. A species bred by wizards Fred and George Weasley that have proven to be very popular in their shop, Weasley's Wizard Wheezes. They are extremely fluffy, and bred from the creature known as the Puffskein. The most famous Pygmy Puff would probably be Arnold, who belongs to Ginny Weasley. Arnold can be seen in the sixth film upon Ginny's shoulder on the Hogwarts express.

According to Luna Lovegood...they are known to sing on boxing day.