I love medusa- they are fascinating because of their 98%-watered body with no brain. And recently scientists have discovered they are immortal (or can be if they want, because they have the mechanism that enables them to re-young their cells). And they are stunningly beautiful.
I also love dolphins and wild cats (all of them- Jaguar, Puma, Lion, Cheetah and so on).
Dogs are on my top list too, home-cats recently too.
Not to forget about the beautiful coliber