Silly question here but my daughter has asked me over and over to post this question. When you enter acid worm area of Kraid there are two sets of side hoppers in the first room but when you come back through one set is missing. Anyone no why that is? Keep in mind this is a question from a 7 year old lol!

Your daughter (future speedrunner?) raises a good point. I tested this and it turns out that the event flag that turns on the ziplines in Kraid also despawns those two sidehoppers. Why? Who knows! There are a few other examples of event flags affecting enemy spawns, but usually it's to make more enemies later in the game. It's possible that the developers wanted to make it less likely for people to die on the way back from acid worm, since there is no save point immediately after beating the boss.

Feel free to post any more questions she has, maybe she'll find early power bombs next.

Thanks a lot brother. You certainly made her day answering that for her. She's now on the hunt for early power bombs lolz

She sounds friggin' awesome lol

Saw this while scrolling through the forums looking for something else. I believe the idea is that those 2 sidehoppers grow larger and become the ones seen in the upper left part of kraid