They were eating the Popo, and now they are gonna eat me.. Oh my god!!

Imagine you're eating tuna sashimi.
Then you saw some white string-like organism crawl out and say 'why hello there nice day 'innit?'

I bet your face would look like that.

"Oi, oi, wot's all this then?"

I know some Khezu ecology thanks to cutscenes, but I honestly never expected Khezu to be similar to a parasite wasp. And it is classified as a "Strage Wyvern" too.. We have so much to learn.