What animal produces musk, a substance used in making perfumes?

A good forum-friendly reply for Fragrance Artisans could be:

Musk is a natural substance originally obtained from the male musk deer, which produces it in a gland to attract mates. Because of ethical and conservation concerns, real musk from animals is no longer commonly used in perfumery. Instead, most modern perfumes use synthetic or plant-based musk alternatives that replicate the warm, sensual scent while being cruelty-free and sustainable.

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