fossilized mobs

around the bones in the nether and in the overworld smaller fossils will appear in blocks so when you do archeology on those blocks you can get bones of different mobs nether mobs will only be findable in the nether though but using the fossils and an armor stand you can make bone modals of the mob and if you have the head of the mob you can make a non-skeletal version of the modal and if you use a totem of undying on the completed with the mob head modal it could bring it to life the skeleton however (or wither skeletons) you can use either a skeleton head or fossil for because they were already skeletons but most fossils wont have heads to collect.

Thank you for your time, listening to my idea, making Minecraft better every day, and I hope you have a fantastic day!