Fireflies

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"They're like little fires in my pocket!"

- Willow

Fireflies are light-producing bugs that appear at night in Forest and Grassland biomes and all the time in Caves, mainly in Mushtree Forests. They can be captured with a Bug Net, even during daylight hours (by pressing space bar). Because they do not respawn, they are considered a finite resource. They are used to make Pumpkin Lantern and Miner Hat. They can also be used to refuel Miner Hats and Lanterns by 39%.

Standing in the fireflies light resets the timer in which Charlie will attack during the night, though the light from fireflies will disappear until the player leaves their vicinity. If the player does not have a source of fire, he or she may "firefly hop" between three or four groups of fireflies for survival during the night. This can still be dangerous, as sanity will drop significantly.

Releasing fireflies near the Fire Pit or other key locations in one's base camp might come in handy, as glowing light will indicate their positions in total darkness of the night.

Fireflies will take up space, so the player is unable to build in that spot unless they are caught.

Reign of Giants icon.png of Giants
Fireflies can be found abundant in a Deciduous Forest. Making this biome as one of their natural habitat.

Trivia

 * Despite Maxwell's quote on the Miner Hat ("Eventually the Firefly will starve"), Fireflies are one of the few creatures that don't starve in your inventory.
 * In the Reign of Giants DLC there was an alternative method of getting Fireflies: by destroying Tumbleweed. The chance to obtain fireflies from Tumbleweed has been removed in Patch 103865 form June 12, 2014