After even more listens, I think I've got a solid ranking for Fauna.
(A+ Tier)
1. Eyes of Ebony
(A Tier)
2. Elephants Never Forget
3. The Alphabet of Me
4. Nightingale
5. Beneath the White Rainbow
6. Island in the Clouds
7. Taurus
(B Tier)
8. Sempiternal Beings
9. Lovebite
As far as album rankings go... Fauna doesn't reach the highs that other Haken albums get to, but it is very consistently enjoyable. The Mountain is my #1 Haken album, but after that I'm unsure of how to even rank the rest. They're all so great in their own ways: Affinity and Fauna are what I'd consider the band's most creative and unique works; Aquarius and Vector have many of my favorite instrumental sections from the band; and while Visions and Virus are relatively inconsistent, they also have my two favorite Haken songs (Visions and Messiah Complex). I am impressed with how strong of a discography Haken's built up for seven albums (and an EP I need to hear more of).