A stray cat turned up at my house with a botfly larva in her throat. It was so horrible. The thing would sometimes poke its head out. I took her to the vet and she removed it. She said it was called a “wolve”. I’m so sorry that happened to your poor kitty.
The ones that get into cats (and dogs and squirrels and rabbits, etc.) are larvae of a different genus of botfly from the “bots” that infest horses. The ones in horses are inside their stomachs, and there can be gobs and gobs of them.
‘She said it was called a “wolve”’
Warble?
https://www.petmd.com/cat/parasites/botfly-infestation-how-handle-warbles-cats