[Retric]

Recent updates to Taxonomy have used DNA testing along with genetic drift to move things around a fair bit. So, in the modern context it's really more a map of evolutionary change than a list of animals with their traits.

Which leaves Anatomy and Cellular biology, but again only when looking at individual species. Even just showing the 'fish' like stage of a human embryo brings up rather difficult questions without evolutionary context. As is a lot of the stranger parts of Anatomy and Cellular biology.

PS: By 'fish' I mean when you basically have head + spine and before leg's show up.