This is gonna be great! I have a few ideas to help your bears be self sustaining and let them thrive. Like a new building called the blacksmith hut, it takes double the materials of a house but produces a random tool every now and then. A nursery building that's like the blacksmith hut except it produces bears, and occasionally a dino. Trees should drop 1-2 nuts when destroyed. Bows for ranged bear attacks would be neat, Spider monsters that are like zombies except they don't infect. Anyways, 10/10 would kill the entire bear population with zombies again. Edit: If zombies are far away bears should ignore them and go about their day, also, all of these are just ideas, I don't expect them, i just think they'd be really neat.