Parseltongue

Parseltongue is the language of serpents (as well as other magical serpent-based creatures, like the Runespoor) and those who can converse with them. An individual who can speak Parseltongue is known as a Parselmouth. It is a very uncommon skill, and is typically hereditary. Nearly all known Parselmouths are descended from Salazar Slytherin with Harry Potter being the notable exception.[1]
 * "Hannah, he’s a Parselmouth. Everyone knows that’s the mark of a Dark Wizard. Have you ever heard of a decent one who could talk to snakes? They called Slytherin himself Serpent-tongue."
 * —Ernie Macmillan to Hannah Abbott after Harry Potter's ability to speak Parseltongue was revealed [src]

Parseltongue is, when spoken, a hissing sound, similar to that of a snake; as such, normal people cannot understand it. Aside from serpent-based creatures, Parselmouths can communicate with each other with the language, as Harry understood Tom Riddle's commands to Salazar Slytherin's basilisk, and the House of Gaunt communicate with each other almost exclusively in Parseltongue. While inherited, Parseltongue usually requires the speaker to face a snake-based creature or object shaped like a snake (i.e. a carving), the Gaunt family was very proficient in the language - enough so for Morfin to speak to Bob Ogden with it.

The ability to actually speak Parseltongue — not just imitate it as Ron Weasley did — is considered an attribute of a Dark Wizard, which is partly due to the fact that both Salazar Slytherin and Lord Voldemort possessed this ability. Another notable Dark Wizard who was also a Parselmouth was Herpo the Foul. However, as Albus Dumbledore pointed out, there are Parselmouths among the good as well, the most well-known of which was Harry Potter. Paracelsus a notable alchemist and a "medical genius" is credited with the discovery of Parseltongue in the sixteenth century, despite the existance of speakers like Herpo the Foul or Salazar Slytherin in the classical and medieval ages. {| class="toc" id="toc"

Contents
1 Harry Potter as a Parselmouth
 * 2 Known Parselmouths
 * 2.1 Other Incidents of Parseltongue
 * 3 Etymology
 * 4 Behind the scenes
 * 5 External Links
 * 6 Appearances
 * 7 Notes and references
 * }

Harry Potter as a Parselmouth
Harry: "I spoke a different language? But I didn't realise it! How can I speak a language without knowing I can?"
 * Hermione: "I don't know, Harry, but it sounded like you were egging the snake on or something. Harry, listen to me. There's a reason the symbol of Slytherin House is a serpent. Salazar Slytherin was a Parselmouth. He could talk to snakes too."
 * Ron: "Exactly! Now the whole school is gonna think you're his great-great-great-grandson or something."
 * — Harry Potter, Hermione Granger, and Ron Weasley after Harry speaks Parseltongue [src]

[2] Lord Voldemort passed the ability to speak and understand Parseltongue on to Harry Potter when he attacked him in infancy in 1981, inadvertently and unknowingly making him into a Horcrux[3]. Harry first experienced conversation with snakes at age ten when he was taken to the zoo with his cousin Dudley Dursley and found himself communicating with a snake while in the reptile exhibit. Harry inadvertently caused the glass of the snake's tank to vanish, enabling it to escape and trapping his cousin Dudley inside the Snake exibition and the glass returning and trapping him without the snake inside whilst Harry laughing at his cousin, Dudley, and not knowing what to do about it.

Harry was not consciously aware of his ability to speak Parseltongue until 1992; he was pitted against Draco Malfoy in the Duelling Club and was able to communicate with the snake Draco conjured to attack him. This caused hysteria among his fellow students because graffiti on the walls of Hogwarts Castle foretold that the Heir of Slytherin would open the Chamber of Secrets, unleashing a monster that would attack the school's Muggle-born students. The Heir of Slytherin was in fact Voldemort, but Harry was able to gain access to the Chamber by speaking the password in Parseltongue, and subsequently killed the basilisk within.[4]

Harry also used his skill in Parseltongue to open Salazar Slytherin's Locket. When Harry, Ron Weasley, and Hermione Granger returned to Hogwarts to search for Voldemort's final Horcrux, Ron managed a weak imitation of Parseltongue to re-open the Chamber of Secrets so that he and Hermione could fetch basilisk fangs, which Hermione used to destroy Helga Hufflepuff's Cup.[3]

After Lord Voldemort destroyed the fragment of his soul residing in Harry, Harry lost the ability to speak Parseltongue, about which he was glad and relieved.[5]

Known Parselmouths

 * Herpo the Foul
 * Salazar Slytherin
 * Paracelsus
 * Marvolo Gaunt
 * Morfin Gaunt
 * Merope Gaunt
 * Voldemort
 * Harry Potter (from 1981 to 1998)

Other Incidents of Parseltongue

 * Ginny Weasley was able to speak Parseltongue while she was possessed by Tom Riddle's Diary, which enabled her to open the Chamber of Secrets.[4]
 * Ron Weasley was also able to open the Chamber of Secrets during the Battle of Hogwarts by imitating a fragment of Parseltongue he had heard Harry Potter use to open Salazar Slytherin's Locket, though it took him several tries to make it work.[3]
 * Albus Dumbledore understood, but did not speak, Parseltongue.
 * Bathilda Bagshot's carcass spoke in Parseltongue while it was occupied by Nagini.

Etymology
J. K. Rowling has said that she took the name Parselmouth from an "old word for someone who has a problem with the mouth, like a hare lip"[6].

Behind the scenes

 * When Harry Potter and Hermione Granger went to Godric's Hollow in 1997, Nagini (inside the corpse of Bathilda Bagshot) tells Harry to "Come!" from the next room in Parseltongue. In reaction, Hermione jumps and clutches Harry's arm, and the two of them obey the command.[7] It is unknown how Hermione seemed to understand this command, though it could be that she did not hear it well, and merely followed Harry. She could also have been frightened by the hissing sound she heard and then followed Harry.
 * In the Philosopher's Stone film, Harry converses with a Burmese python, rather than a Boa Constrictor.
 * Whenever it was spoken in the films, Parseltongue went untranslated except for one scene in Harry Potter and the Deathly Hallows: Part 2 when Voldemort was speaking to Nagini, where it was given subtitles. It was also heard in English in the first film when Harry was talking in the Zoo.
 * In the films, Parseltongue is depicted as sounding like a sibilant-filled language with readily discernible phonemes created by Dr. Francis Nolan (As listed in the credits for Harry Potter and the Deathly Hallows). In the novels, it is only ever described as a low hissing noise.
 * In the films, as Harry draws near a Horcrux he can hear, in addition to a whining noise, a faint voice which seems to speak in Parseltongue.

Appearances

 * Harry Potter and the Philosopher's Stone (First appearance)
 * Harry Potter and the Philosopher's Stone (film)
 * Harry Potter and the Chamber of Secrets (First identified as Parseltongue)
 * Harry Potter and the Chamber of Secrets (film)
 * Harry Potter and the Chamber of Secrets (video game)
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Goblet of Fire (film)
 * Harry Potter and the Order of the Phoenix (film) (Heard in opening shot)
 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Half-Blood Prince (film)
 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 1
 * Harry Potter and the Deathly Hallows: Part 2
 * LEGO Harry Potter: Years 1-4
 * LEGO Harry Potter: Years 5-7

Notes and references

 * 1) ↑ Harry Potter and the Half-Blood Prince
 * 2) ↑ Harry Potter and the Philosopher's Stone
 * 3) ↑ 3.0 3.1 3.2 Harry Potter and the Deathly Hallows
 * 4) ↑ 4.0 4.1 Harry Potter and the Chamber of Secrets
 * 5) ↑ 30 July 2007 Bloomsbury LiveChat
 * 6) ↑ 2003 Albert Hall Interview
 * 7) ↑ Deathly Hallows, Ch. 17

Thank you very much to the Harry Potter wiki from which I have gotten all my material!