These aren't necessarily done by Foley artists. They could also be done by computer generated sounds. But if you know anything about Foley, it could still be something as simple as tin foil, you know? I think the best way to find out is to email some people from the movies. They are busy people, but the really do try to get back to you when you're inquiring about things. even emailing JK Rowling's people might help, they got back to me in a day.
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The characters name is Snape, and in the movies he is played by Alan Rickman. The snake Nagini is computer generated and has sounds created by Peter Burgis as the foley artist and Dominic Gibbs as Sound Designer.
That would be a Foley artist. Very cool job. Well, actually, there are many people involved. A Foley artist is the person that creates the sounds (e.g. claps the coconuts to make horse galloping sounds). That's the fascinating part to me! They work with a recording engineer who captures the sounds. There is also a person who does the sound editing in a movie (the mixer, I think). That is the person who decides what audio to use from the original shoot, from the foley artist, from a sound effects database, overdubbed with music, etc. etc. Technically that would be the person who "puts them in" the movie. interesting interview with a foley artist at http://woodyssoundadvice.com/?p=22
Foley effects are sounds made and recorded for movies but added after the visual portion has been recorded. Foley artists use a series of tools and props usually banged together or dragged on each other. Th euse of foley effects dates back to silent movies when a piano player and a helper made all of the sounds for that movie.
Annarose Foley's birth name is Annarose Foley.
Alina Foley's birth name is Alina Chiara Foley.