As a proper noun fauna
is (roman god) the goddess of animals, nature, spring and fertility; she is also the consort of faunus.
As a noun aquariology is
the study of the fauna and flora of aquaria.
Other Comparisons: What's the difference?
(uncountable) animals considered as a group; especially those of a particular country, region, time, etc.
(countable) a book, cataloguing the animals of a country etc.
The study of the fauna and flora of aquaria