Ladybirds, you mean the species that literally turn into all-consuming swarms if the food competition is too high that make locust problems pale in comparison and literally start eating everything that moves, even if it's much bigger than they are, to the point that they start attacking humans (and other big animals) if they have to?
I see no way this can go wrong
When has this happened?
I think there is mistaken identity... Ladybird beetles are also known as ladybugs in the US. The most harm they do by swarming is getting into people's houses when it turns cold, looking for a place to overwinter.
Edit
I have been digging hard to see if there are any instances of the beetles being harmful; Found one.
https://www.goodhousekeeping.com/life/pets/news/a41272/asian-lady-beetle-dog-mouth/
I read it above as ladybug, so if ladybirds are still ladybugs, then it's all the same.
And yes, ladybugs will fucking eat you. What I mean by food competition is that when they get too many for the amount of food they have, they will turn to eating
anything. I mean, they won't eat a person, obviously. You're too big, they can't even pierce our skin. But that won't stop them from trying! They will bite you. And you will screech like a little girl and people will laugh at you because you screeched at a ladybug.
Even the ladybugs are metal af in Scriver's part of the world.
Seriously, they are basically nature's perfect predator. Thought that would be wolves, or jaguar, or crocodiles or sharks? Nope, it's fucking ladybugs. They're a natural tank shaped death bulldozer who goes wherever they want, eats whatever it wants, and if there's not enough around to eat then the little bullpanzer will just take of and fly to the next massacre-to-be. If anything would get close enough to threaten it it will release a slurry of fungus through it's shell (because of course the tank also comes equipped with biological weapons) so that if against the probability they're killed they will still make sure that you die too, and that if you're a hive animal then you'll carry the fungus back to your friends and infect them too. Just as one last big fuck you from beyond the grave.