Otter

Otters are nimble creatures and talented swimmers. Playful and dexterous – they have even been known to juggle rocks. Known for their intelligence, it is no surprise that Hermione Granger also has this Patronus.
Written by the harrypotter.com team
“The Patronus is a kind of positive force, a projection of the very things that the Dementor feeds upon - hope, happiness, the desire to survive – but it cannot feel despair, as real humans can, so the Dementors can’t hurt it.”
JK Rowling signature