*Below floor 880 in the [[Skull Cavern]] on non-[[Skull Cavern#Prehistoric Floors|Prehistoric floors]], Iridium Bats will be colored red and have double health and greatly increased speed.<ref name="deepbats" />
+
*Starting at and below floor 880 in the [[Skull Cavern]] on non-[[Skull Cavern#Prehistoric Floors|Prehistoric floors]], Iridium Bats will be colored red and have double health and greatly increased speed.<ref name="deepbats" />