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Ian MacKinnon and Peter Saunders, the artists behind The Fantastic Mr. Fox, (also did stop motion animation for Nick Park’s Chicken Run, Tim Burton’s The Corpse Bride, and Henry Selick’s Coraline) talk about the tiny details in the making of.
Read the full article in Vanity Fair, which includes a slideshow of sketches.
Favorite quotes from the article below.

The animals’ fur was a combination of artificial fur, plucked off toys, and real goat’s hair, which was dyed using everyday supermarket hair dyes. Getting each character’s hair coloring exactly right required specific, individual dying times. The human characters’ hair, meanwhile, was harvested from the scalps of studio employees.
“We’d go around the workshop and find someone who had matching color hair and take clumps out of it,” says MacKinnon, “and then we’d punch it into the surface of the puppet.”
“Every last detail was made by hand, including screen printing particular fabrics that Wes was very keen to have.”
Mr. Fox’s suit, which was made from the same corduroy as one of Anderson’s signature get-ups. “He sent us his trousers so we could match the corduroy,” recalls MacKinnon. “He said that he wanted Mr. Fox to wear a yellow corduroy suit, ‘the sort of suit you’d see on any man walking down the street in Paris.’ And we were in Manchester, thinking, Well we don’t see many men walking down the street in suits like that!”
and Making Of video about the animation process: