1. Blister Beetle
When squeezed, the Blister Beetle ejects a chemical toxin that irritates the skin.
2. Cow Killer
If you come across a Cow Killer, take extreme measures not to touch it. It has a ferocious sting.
3. Giant Water Bug
This bug uses its small pincers to catch prey like frogs, small fish and even snakes. But it also uses the pincers to be a jerk. They are called “toe biters” because they’ll pinch your toes if you get too close.
4. Black and Yellow Garden Spider
Between the scary yellow and black pattern and the fact that the females get enormous, this spider is terrifying to anyone with arachnophobia (or anyone, really).
5. Great Golden Digger Wasp
This wasp actually isn’t aggressive despite its bright color. But that doesn’t mean it won’t sting you if it feels threatened.
6. Masked Hunter
The Masked Hunter is a type of Assassin Bug, meaning it stabs its prey to death with its beak (which it also uses to “bite” humans). These bugs are nocturnal and feed off bed bugs, so if you see one in your home, you've probably got bigger issues to deal with.
7. Nursery Web Spider
These spiders are named for the excellent care they take of their egg sacs. Their bites aren’t venomous, but we still wouldn’t want to get in between this mama and her babies.
8. Yellow Jacket
This is one of the most aggressive wasps with an exceptionally painful sting.
Ticks are blood-slurping, disease-spreading little parasites. Check your clothing for them after every hike.
10. Black Widow Spider
Let that red belly be a warning. A Black Widow’s bite can be fatal, especially to children and the elderly.