@HeatherL I got the young bison to use a separate palette now, but I can't seem to introduce sexual dimorphism to the adult bisons. We are still lacking resources on hex editing, but theoretically this should be possible since Jymn did a number of them.
Anyway, I sidequested a little bit. This is a hack that I have configured a while ago but only got around to compiling them into a file just now upon a request from Khaydar.
Underwater volcanoes are well-known, and they spew lava right to the ocean floor despite all that water pressure above them, so it stands for reason that we should be allowed to place the volcanoes ingame underwater too.
Another structure associated with volcanic activity on the ocean floor is the hydrothermal vent. Sadly we don't quite have anything like that in the game yet. I decided to chuck the existing steam vents and geysers too so they can function as makeshift hydrothermal vents.
Aside from tank compatibility, I also made them exhibit neutral, indestructible, and reduce their footprints for easier landscaping.
I know some users prefer new items over hacks. While I don't have time to turn these into unique items, anyone who want to do so are welcomed to take a jab at them. Otherwise, the hack should have no impact on your old zoos. Credits to Pixigger's Exhibit Scenery for inspiring me to find ways to make more existing scenery items exhibit-friendly. The file has been submitted to Zooberry and should be available soonish.
Here is an example enclosure, as a bonus.