On Guard! The territorial dragon.

Some dragons are fiercely territorial and will attack other dragons on sight! However direct confrontations are rare in our modern age, mainly due to the rarity of dragons and their desire to remain secretive. Mankind’s relegation of dragons to fantasy has greatly aided their survival. They don’t need a noisy, fiery battle making people aware of them. No one is sure how large a territory a dragon needs, but a ready supply of food, water and treasure is a must.