Ciao rashunda,
the Castoreum is plainly leathery, a trapper’s perfume. The Civet at first seems even more animalic, cheesy and faecal, but the smell that lasts is indeed sweet, fruity and flowery, but still distinctly animal.
For the reason that make perfumes with animal scents on a different level you can read my theory on tri-dimensional perfumery.

AbdesSalaam Attar
Compositore Profumiere