Ya learn something new every day.... Ambergris is used in perfumes or as a perfume. I thought it was a type of amber (a tree resin product), but it is totally unrelated.
Ambergris is basically, sperm whale trace. You know how hawks and coyotes vomit up the undigestible parts of their food? So do sperm whales. The stuff the eject is fould and gross, but after it floats in the sun, on the ocean, for many years, it becomes ambergris - worth a small fortune too.....
BBC on ambergis