just read a little bit about grasshoppers and which animals like to eat them.
its stated that hedgehogs, shrews, moles, rats, martens, foxes, cats and boars like to eat them, even tho they are not specialized in them.
they also mention birds and spiders, as long as they are big enough, eat them.
the most interesting part was about the human beeing the biggest threat to them by fertilizing the fields, but its not statet which fertilizer is the most harmful.
i have no idea how and if u can use this info, but i wish u the best