Magical Creatures:
* Unicorns: A majestic, mythical creature known for its silver horn and pure magic.
* Three-Headed Dog (Fluffy): A monstrous guard dog that protects the Sorcerer's Stone.
* Snakes: Snakes are a recurring symbol of the Slytherin house and are associated with Parseltongue, the ability to speak with snakes.
* Aragog (and his family): A giant spider who lives in the Forbidden Forest.
* Hippogriff: A magnificent, winged creature with the head and forelegs of an eagle and the body of a horse.
* Dragons: These powerful creatures appear throughout the series, including Norbert (a Norwegian Ridgeback).
* Centaurs: Intelligent and powerful creatures that inhabit the Forbidden Forest.
* Thestral: These skeletal winged horses are invisible to most people, but can be seen by those who have witnessed death.
* Manticore: A mythical creature with the head of a human, the body of a lion, and the tail of a scorpion.
Regular Animals:
* Cats (Mrs. Norris): The caretaker, Argus Filch's, cat is a symbol of mischief and vigilance.
* Rats (Scabbers): Ron's pet rat, who is later revealed to be a wizard named Peter Pettigrew in his Animagus form.
* Owls (Hedwig): Harry's loyal and intelligent owl companion.
* Toads (Trevor): Neville Longbottom's forgetful and clumsy toad.
* Dogs (Fang): Hagrid's loyal and powerful dog.
* Bats: Found in the Forbidden Forest and in various magical creatures' habitats.
* Birds: Various birds are present, including a flock of crows that frighten the first-years.
* Mice: Ron's pet rat, Scabbers, is a recurring figure.
This is not an exhaustive list, but it covers some of the most prominent animals in Harry Potter and the Sorcerer's Stone. The magical world of Harry Potter is full of fantastical creatures, and these are just a few of the many that appear in the book.