Natural Feature → Lair → nest/aerie
Creature responsible: Monster → Legendary → dragon → Earthbound → dog/fox/wolf
Visibility: visible at near distance
Made with Ruby and Roda
For the curious, the source code is available on github.
Random tables from The Perilous Wilds by Lampblack & Brimstone
Adventure Generator based on "Random Sword & Sorcery Adventure Generator" by Ben Ball