Really interesting to read. So IIUC ambergris is _sometimes_ formed in the 4th (last) sperm whale stomach, is basically a constipatory plug of indigestible squid parts (beaks, quills, and eye lenses) which either eventually passes thru the whale’s anus, ruptures the intestine and kills the whale, or is (was?) harvested on rare occasion by whalers. And if you’re lucky you can find it washed up on beaches.