Such a great and fun addition to the Creatura API. Great model with smooth animations, looks very vivid and natural, feels right at home in the world of Minetest Game! It's a bit rare to find dragons and dragon nests throughout the world, took me a long time exploring to come across one... I guess this might be good as the player could be attacked too easily if they were everywhere, I presume they're intended to be a rare treat to come across.
I spawned a fire and ice dragon next to each other to try it out, without realizing they're enemies at first: It was fun to watch them fight and destroy the environment around them in the process! On the opposite end, seeing them sleep is surprisingly cute... yes, the one thing you should never call a dragon :)
This is an incredible mob API! I compared it with Mobs Redo, and while each has its uses this definitely seems like the superior choice. Everything animates naturally and smoothly, very responsive unlike most mob mods where creatures often travel in straight lines and get stuck walking into walls before snapping to a different rotation. The code looks clean simple and easy to understand: Developers can schedule actions and events using scores to pick the most important, giving external mods that define their own creatures the ability to easily inject custom mechanics using a short function. Creatures that walk on land or swim in water or fly in the air (or any mixture of the 3) are all supported, as is the ability to give them special attacks and targets so they may attack other creatures... the boids system that makes birds flock together is absolutely superb! Performance is itself remarkable considering all those features, even with a lot of creatures at once I didn't see a huge CPU increase I can attribute to the entities... it's worth noting that pathfinding is being used which makes this all the more remarkable.
This is literally one of the best mods for Minetest in my book, by far the best mob system available! It got everything right: The attention to detail is formidable, I spent over an hour playing with this to see how everything works together... the birds and how they fly together is just beautiful and extraordinary, couldn't believe I'm seeing that in Minetest.
One thing I greatly appreciate is that you haven't used any models that break the style: Most mob models make exceptions for curved / deformed boxes and / or using textures at various resolutions which is immediately noticeable when you look close... not here where everything is a cube / rectangle and pixel density is consistent with 16x texturing by default!