The Zoological Society is a learned society and zoological museum in Tarant, run by local naturalists and related scientists. The museum houses several exhibits on the continent of Arcanum's natural history.
Inside there are three exhibits. If you click on the sign in front of the dragon skull, the Lair of Bellerogrim will appear on your world map. If you open up the ancient iron chest (either by eventually creating the key, or by using a fate point) you'll find a map to "the place of lost voices" and three ancient iron drums. This is just a piece of the Iron Clan quest, which is triggered at the Wheel Clan.
You can also talk to Dr. Tristan Fenwick, the head of the society, but nothing much will come of it. Fenwick is involved in a quest originating in Stillwater, so don't kill him.