Burrow

A Burrow is a naturally occurring object from the Reign of Giants DLC that randomly spawns in Grassland Biomes. Moleworms will spawn at Dusk and Night from Burrows and start roaming around the area, looking for minerals and other ground-based items to store inside the Burrows.
Burrows can be dug up with a Shovel to randomly yield Rocks, Flint, Nitre, and Gold Nuggets. When dug, Burrows will also drop any item stolen by Moleworms. Burrows can store up to 50 inventory slots; any extra items that moleworm attempt to store, but cannot do so due to filled inventory, will pop out.
If a Burrow is dug up, the Moleworm that inhabited it will make a new one after some time. This makes Burrows renewable as long as the Moleworm is not also killed. 
If a Moleworm is killed, the Burrow will spawn a new Moleworm after 2.5 Days, in the same way Rabbit Holes spawn Rabbits. However, it is worth noting that even if all of the Moleworms and Burrows in a world are killed or destroyed, respectively, they are still renewable through both Catcoons, Tumbleweeds and Earthquake. 
Because Burrows drop minerals and Moleworms can create new Burrows, this makes Rocks, Flint, Nitre, and Gold renewable.
If a Moleworm is taken and dropped down in the Caves, it will create a new Burrow down there. Additionally, if so taken without destroying its original Burrow, that Burrow will eventually spawn a new Moleworm in the surface. Burrows are thus not only renewable, but able to be actively expanded by player action into Moleworm farms.
vi:Burrow
fr:Taupinière
Category:Reign of Giants
Category:Mob Spawning Entities
Category:Diggable Objects
Category:Mob Housing
Category:Non-Flammable
Category:Naturally Spawning Objects