I just watched that video of the white cabbage larva with the smaller larvae exiting its body. Jeez, it's still alive after THAT? Life's rich pageant, I guess.
Hornworms are a delicious treat for any lizard large enough to eat them. Bearded dragons seem to love them. If you catch them and put them into a container with a food/water source anyone with a pet like that will happily pay you for them.