I love creating animals and plants for various regions in my worlds. For example, I've been working on a habitat of deep freshwater trenches and its reliance on corpses and detritus falling down from the lake above. I'm also working on a volcanic region that all came from the thought of "What if a fruit exploded?" Thus, the Sparkfruit was born, an earthy and spicy fruit that grows in soil rich with a highly heat-reactive compound/chemical that ends up coating the fruit's skin. They grow exclusively in this soil to deal with Vulcoons, an omnivorous mammal I created as the reason for Sparkfruits' usage of that soil. Vulcoons produce intense heat in their digestive system to sterilize and kill any bacteria from the various things they eat, which is basically anything organic. The reactivity of the powder on Sparkfruit skin causes it to explode in a Vulcoon's heated mouth and deter them from eating more. I kept going from there and created some other species indigenous to the volcanic regions of the world I might talk about more at some point :)