How dangerous is a praying mantis's spit?

I will presume that by "spit" you mean "saliva." I do not know of any mantids that utilize projectile saliva in any way, whether by drooling it all over the place or shooting it like a bullet. If you ever find one, I would be curious to see it. read more

Praying mantis do not spit. They are very quick and will run if threatened. They do have pinchers and can pinch a person but it is rare. I breed a few different types of praying mantis and have never heard of them spitting. Stick insects on the other hand can submit a defensive spray that smells moldy and can be painful if it gets in your eyes. read more

No, praying mantis may "spit" a brown substance around their mouths as a defensive regurgitation like some other insects do, but this secretion is not dangerous to humans. It is a myth that they can be harmful to or even kill humans. read more