Scariest animal?

The Japanese giant "murder" hornet. The sting feels like hell and 50 people die annually, Just no.

Horses freak me out. Dead eyes. Like the zombie version of a donkey.
- I dislike how they are large, scared of everything, and highly unintelligent. Walking behind a horse is just begging for a dented skull.
  
  Agree, horses terrify me

Jellyfish. They're so deadly and so oblivious to how deadly they are. They scary. The entire ocean is scary.

Looking at the mouth of a lamprey makes me feel extremely uncomfortable
- Theres a dam in Oregon that has a glass screen on the fish ladder. And they have an annual lamprey run. Just a glass wall covered in Lamprey.
  
  I'll just stay away from Oregon forever now

im pretty scared of kangaroos, half of them are like cute little rabbit dogs and then there's randomly some of them that are like, steroid-jacked dog murderers with a secret tailspring disemboweling kick attack, the fact that the scary ones exist and are the same species as the cute ones means that you can never be sure if interacting with the cute ones will attract the ire of the scary ones. their physiology is way different from other mammals, if a kangaroo invented a car it would not have wheels but gigantic spring loaded skis and you would pilot it from a dark and warm mucosal sac. i actually think that the tall aliens in halo are probably canonically kangaroos
- kangaroos are scary because half of them are cute little rabbit dogs and the other half are steroid-jacked dog murderers with a secret tailspring disemboweling kick attack. Since the scary ones are the same species as the cute ones, you never know if interacting with the cute ones will frighten them.

When I was a toddler my parents went hiking in the woods with me and accidentally stumbled their way in between a moose and her calves, which is not somewhere you ever want to be. So being charged by like a 400 kg moose is kind of a formative memory.
- Huh moose are smaller than I thought
  
  The males are much larger. Not that this looked small, mind you. Especially to a toddler.

Scariest animal I’ve ever seen was a bull elephant in musth. Imagine an elephant but with 100x the testosterone, pissing ketones out of its permanent boner and oozing protein out of its temporal glands which are so swollen they’re pressing on his eyes causing constant pain and pouring into his mouth. They charge and kill pretty much everything shit is like Jurassic Park

its a shark or saltwater crocodile, combine being out of our element (land) with the size/speed of a big cat or bear. though tbh a polar bear makes a decent case independently
- Polar bears one of (the?) only species that has zero compunctions about hunting people. If it sees you it sees a meal.

I have a lifelong phobia of baleen whales. The ones with teeth are cool though - they're just big dolphins.

I'd have to go with something like tapeworms. Drawing a blank on specific genus and species since it's been years since my microbiology courses, but the things acute parasitosis can do to the body is some body horror stuff. They're so unassuming and yet everywhere. That said, there is a part of me that thinks worms ::: spoiler spoiler in the eyes has to be pretty wicked to experience POV. ::: . A close second has to go to the classic unleashed dog.
- Oh yeah, parasites are crazy scary. Bot flies freak me out

Venomous snakes. Black Mamba, Taipans, Death Adders, Bushmasters, Sea Snakes, Cobras, etc. They're cool and all, but I've got a healthy respect for them.
I got to go to the Serpentarium in Wilmington NC a few times and they've got a lot of the most deadly snakes out there. The currator has survived multiple Bushmaster bites and looks like Robert Downey Jr. When I was was there once and he was feeding some snakes, someone asked him if he ever gets scared, dude just shrugged and said "I've already had so much to drink today, I don't really care"... 😳
- Man feeds Death every day and knows it.

There are a lot of scary animals out there, but I think the worst that I have to come into contact with regularly is the centipede. Definitely not the worst, but when one of those fuckers darts out from underneath a bookcase or something like some demon from hell, only to disappear under your nightstand or something it’s truly a horrible feeling. You know it’s there but there’s nothing you can do, you’re never seeing that fucker again unless he wants to be seen.
They’re not that bad, they just look demonic. Fortunately I don’t have to regularly deal with very many scary animals, this is sorta the worst I have it.

A deer skeleton standing on it's hind legs and walking like a man, shrouded in black tatters and brandishing a blood crusted scythe
Also it's at night and there's a full moon, but it's cloudy so you still can't see very well