Spore Bat

Type	Flying Enemy
Environment	Glowing Mushroom biome
AI Type	Bat AI
Damage	13/26›92›116/39›138›174
Max Life	16/32›140›176/48›210›264
Defense	2/2›8›10
KB Resist	20%/28%/36%
Banner	Spore Bat Banner
Coins	90Pre-Hardmode: 225Hardmode: 720Post-Plantera: 9
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_4.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Spore Bat is a variant of the bat that spawns in underground Glowing Mushroom biomes.

It has the same stats as a Cave Bat. However, Spore Bats have a chance to drop a Shroomerang.

Notes

The Spore Bat and the Spore Skeleton are different from all other Glowing Mushroom biome enemies in that they require the player to be in the biome, i.e., there need to be at least 100 related tiles nearby. In contrast, the other enemies only require a single block of Mushroom grass to spawn on.^[1]

Unused animation frame.

Spore Bats, as well as Jungle Bats, Cave Bats, and Hellbats have an unused frame in the animation that seems to depict a Spore Bat hanging upside down. This may mean that bats were originally planned to be able to hang on ceilings but was later decided against.
The Spore Bat may be a reference to white-nose syndrome, a disease caused by an invasive, psychrophilic fungus that has devastated many North American bat populations.

The Bestiary entry for the Spore Bat: "The tables have turned on a variety of rabid bats, themselves enwrought with a deadly fungal infection."

Desktop 1.4.4: Increased the drop rate of the Shroomerang from 1*1/100 (1%) to 2.5*1/40 (2.5%).

↑ Information taken from the Desktop 1.4.0.5 source code, method SpawnNPC() in Terraria.NPC.cs. There may be inaccuracies, as the current Desktop version is 1.4.4.9.