What are living things that creep you out?

I am a dude and I am afraid of bats lol because one flew up underneath the door to my bedroom when I was asleem and I thought I heard a bird but instead it was a bat, and I never woke up as fast as I did in my entire life. One other time a bat flew up from one of our ac vents and started flying around the living room, and although they are harmless and scared too, they look evil. Turns out our attic door was cracked open, and they flew in through the vents on the side of the house.