You were out and about, casually exploring some cave in the kingdom of Hyrule. Oddly deep cave as well. You noticed you haven't seen any creatures yet spelunking the cave. Though as you thought that, out of the corner of your eye some child-sized insect-looking creature was hopping around goofily and mischievously. Soon after it hops into a giant, round, opaque blob nearby as it makes sploshing and glorping sounds as a result, the insectoid suspended within. You then realize it's the Chu Worm and their blobby partner the Shell Jelly you were told about back in Castle Town. Despite their daunting appearance and what they're known for, they don't seem to pose a threat. Though it'd be wise to still exercise caution.