Living Islands are a lot for deer like than living volcanos. From the moment they hatch, flowers and other small plants will start growing on them. Their Waterfall tail only starts 'growing' when the small river hole on their back gets filled with Rainwater.

They dont need to eat or drink, they can do so if they want to though. All Living Islands and Living Volcanos tend to prefer crystals over anything else.

Living Volcanos are more cat like. The moment they hatch some start eating stones since they help the volcano on their back grow.
They never grow a waterfall tail. They will get a lava tail at some point in their life.

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I might add more, I just wanted to write this down-
This isnt really my species, its more my version?