Aliens with acid for blood are the greatest threat to the galaxy. Are you ready to fight them? Probably not.
On a scale from one to ten, these guys are an eleven at murder.
These things have acid for blood. I mean, that is kind of messed up.
Their only means of reproduction is also their food source which is also their main enemy. That seems like a bad combination.
They do not care about anything but making more aliens. To make more aliens they have to kill everything around them. Run if you want. It doesn't matter.