This small structure spawns in the following biomes:
- taiga
- forest
- snowy taiga
- old growth pine taiga
- old growth spruce taiga
- sparse jungle
- savanna plateau
- wooded badlands

Each den spawns its respective biome specific wolf type. Each den spawns 4 wolves, 3 adults and 1 baby They are quite tricky to spot, look for patches of coarse dirt and unnatural mounds Inside the wolf den you can brush suspicious gravel to get bones to tame the wolves, aswell as the howl pottery sherd and very rarely (1 in 120ish) a skeleton skull
